I created dark chocolate cupcakes with fresh blackberries, a whipped blackberry mascarpone filling and blackberry dark chocolate Swiss meringue buttercream crowned with chocolate curls and a single fresh berry, a pairing I file under fillings for chocolate cupcakes.

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I made these Dark Chocolate Cupcakes with a surprise center of whipped mascarpone folded with fresh blackberries. The contrast is electric, bitter chocolate and bright berries, I cant stop poking holes to peek at the filling.

As someone who writes about Fillings For Chocolate Cupcakes and Dark Chocolate Dessert Recipes I kept tweaking until the balance felt right. The mascarpone stays silky while the blackberries give a clean tang that cuts the richness.

If you like intense desserts with a sneaky jammy heart you might hide these from yourself. Youll want to steal one before guests arrive.

Ingredients

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Dark chocolate: Rich in antioxidants, adds bitter-sweet depth, boosts flavor but not always healthy.
Cocoa powder: Unsweetened, gives intense chocolate taste, provides fiber and minerals, low fat.
Mascarpone: Ultra creamy, high fat dairy that makes filling silky, its rich.
Blackberries: Tart and sweet, loaded with fiber and vitamin C, brightens the cupcakes.
Eggs: Supply protein and structure, help cakes rise and stay moist.
Butter: Adds rich flavor and tenderness, mostly fat and calories, very indulgent.
Sugar: Main sweetener, gives browning and texture, mostly empty carbs, addictive.
Buttermilk: Tangy and acidic, tenderizes batter, adds gentle sour note and moisture.
Coffee: Deepens chocolate flavor, enhances bitterness without tasting strongly of coffee.

Ingredient Quantities

1 cup (125 g) all-purpose flour

3/4 cup (150 g) granulated sugar

1/2 cup (50 g) unsweetened cocoa powder, sifted

1 tsp baking powder

1/2 tsp baking soda

1/2 tsp fine salt

2 large eggs

1/2 cup (120 ml) buttermilk

1/3 cup (80 ml) vegetable oil

1/4 cup (60 g) sour cream or plain Greek yogurt

1/2 cup (120 ml) hot strong brewed coffee

3 oz (85 g) dark chocolate, finely chopped and melted, cooled

1 tsp vanilla extract

8 oz (225 g) mascarpone cheese

1 cup (140 g) fresh blackberries

1/2 cup (120 ml) heavy cream

3 tbsp (22 g) powdered sugar

1 tsp lemon juice

3 large egg whites

3/4 cup (150 g) granulated sugar

pinch fine salt

1 cup (225 g) unsalted butter, softened

3 oz (85 g) dark chocolate, melted and cooled

2 to 3 tbsp blackberry purée or seedless blackberry jam

1/2 tsp vanilla extract

1/8 tsp cream of tartar (optional)

1/2 cup chocolate curls or shavings

12 fresh blackberries for topping

How to Make this

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1. Preheat oven to 350F (175C). Line a 12-cup muffin tin with liners. In a bowl whisk together 1 cup (125 g) flour, 3/4 cup (150 g) granulated sugar, 1/2 cup (50 g) unsweetened cocoa, 1 tsp baking powder, 1/2 tsp baking soda and 1/2 tsp fine salt. Set aside.

2. Melt and cool 3 oz (85 g) dark chocolate. In another bowl whisk 2 large eggs, 1/2 cup (120 ml) buttermilk, 1/3 cup (80 ml) vegetable oil, 1/4 cup (60 g) sour cream or plain Greek yogurt and 1 tsp vanilla until smooth. Stir in the cooled melted chocolate and 1/2 cup (120 ml) hot strong brewed coffee. Tip: hot coffee makes the chocolate flavor pop, but let the chocolate cool so it doesn’t scramble the eggs.

3. Pour wet into dry and fold just until combined, scrape the bowl so no pockets of flour remain but do not overmix. Divide batter among liners about 2/3 full. Bake 18 to 22 minutes or until a toothpick comes out with a few moist crumbs. Cool completely on a rack before filling.

4. While cupcakes bake make the mascarpone filling. Blend or mash 1 cup (140 g) fresh blackberries to a coarse purée, strain if you hate seeds. Whip 1/2 cup (120 ml) heavy cream with 3 tbsp (22 g) powdered sugar to soft peaks. Gently fold in 8 oz (225 g) mascarpone, 1 tsp lemon juice and the blackberry purée until smooth and fluffy. Chill so it firms up, about 30 minutes.

5. Prepare Swiss meringue for the buttercream: in a heatproof bowl combine 3 large egg whites, 3/4 cup (150 g) granulated sugar, a pinch of fine salt and 1/8 tsp cream of tartar if using. Place over a simmering pot of water and whisk constantly until mixture is hot and sugar is dissolved, about 160F or until you feel no grit between your fingers.

6. Transfer the hot egg white mixture to a stand mixer and whip on high until cool and glossy stiff peaks form. With the mixer running add 1 cup (225 g) softened unsalted butter in small pieces, beating until silky. Add 3 oz (85 g) melted and cooled dark chocolate, 2 to 3 tbsp blackberry purée or seedless blackberry jam and 1/2 tsp vanilla extract, beat until fully incorporated and smooth. If buttercream looks loose chill briefly and rewhip. If it breaks, keep whipping and it will come back, honestly it usually does.

7. Core the cooled cupcakes with a small knife or apple corer leaving the bottom intact. Pipe or spoon the chilled mascarpone blackberry filling into each hole, then replace the little top you removed or leave open if you like.

8. Fit a piping bag with your favorite tip and pipe the blackberry dark chocolate Swiss meringue buttercream on each cupcake. Work on a cool surface so buttercream stays firm. If it gets too soft pop them in the fridge for 10 to 15 minutes and finish piping.

9. Finish by sprinkling 1/2 cup chocolate curls or shavings over the cupcakes and topping each one with a fresh blackberry. Store refrigerated because of the mascarpone and egg whites, but bring to room temp 20 to 30 minutes before serving so flavors shine.

Equipment Needed

1. 12-cup muffin tin with paper liners
2. Oven (preheat to 350 F / 175 C)
3. Stand mixer or electric hand mixer (for Swiss meringue and buttercream)
4. Heatproof bowl and small saucepan for a double boiler to melt chocolate and warm the egg whites
5. Mixing bowls (at least 2) plus measuring cups and spoons
6. Whisk and rubber spatula for folding and scraping — dont overmix
7. Fine mesh strainer or sieve (optional) and a blender or fork to puree blackberries, remove seeds if you hate them
8. Piping bag with tips and a small offset spatula or spoon for filling and finishing
9. Cooling rack, toothpick or cake tester, and a small knife or apple corer to core the cupcakes

FAQ

Q: How do I fill the cupcakes with the whipped blackberry mascarpone without making a mess? A: Let cupcakes cool completely, then use a small knife or a cupcake corer to remove a cone of cake from the center. Spoon or pipe the mascarpone mixture in, press the cake cone back in or save it for crumbs on top. Chill for 20 to 30 minutes so the filling sets, that helps stop it oozing when you eat them.

Q: Can I make parts of this recipe ahead of time? A: Yes. Bake the cupcakes a day ahead and keep them in an airtight container at room temp, or freeze unfrosted for up to a month. The blackberry mascarpone keeps in the fridge for 2 days. The meringue based buttercream can be stored in the fridge for up to 3 days, bring to room temp and rewhip before using.

Q: My buttercream looks curdled or too soft, how do I fix it? A: If its too soft pop it in the fridge for 15 minutes then whip again. If it looks curdled, warm the bowl slightly with your hands or a warm towel and beat until smooth. If the meringue never glossy it means the sugar wasnt fully dissolved, reheat the egg whites and sugar over a bain marie then whip again.

Q: Can I swap ingredients like mascarpone, blackberries or buttermilk? A: You can swap mascarpone for cream cheese plus a bit of heavy cream to loosen it, but flavor will be tangier. Use raspberries if you cant find blackberries but expect more seeds. For buttermilk stir 1 tablespoon lemon juice into 1/2 cup milk and let sit 5 minutes. Coffee can be swapped for hot water if you prefer less coffee flavor.

Q: Why did my cupcakes turn out dry or dense? A: Dry usually means overbaked or too much flour. Measure flour by spooning into the cup then leveling, dont pack it. Dont overmix once you add the flour, mix just until combined. Also check your baking powder and soda are fresh and avoid baking longer than needed.

Q: How should I store or freeze finished cupcakes with the fresh blackberries on top? A: If you put fresh berries on top store them in the fridge and eat within 24 hours. For freezing, remove fresh berries, freeze cupcakes wrapped tightly for up to a month, thaw in the fridge overnight, then add fresh blackberries just before serving.

Dark Chocolate Cupcakes With Whipped Blackberry Mascarpone Filling Recipe Substitutions and Variations

Buttermilk: If you don’t have buttermilk, stir 1/2 tablespoon lemon juice or white vinegar into 1/2 cup milk, let it sit 5 minutes till slightly thickened — works great in the batter.
Mascarpone (8 oz): Swap with 8 oz full fat cream cheese beaten with 2 to 3 tablespoons heavy cream until silky; it’s a little tangier but very close in texture.
Unsalted butter (1 cup): You can use salted butter instead, just skip or cut back about 1/4 teaspoon of any extra salt called for in the recipe.
Egg whites for meringue (3 large): Use aquafaba (chickpea liquid) at 3 tablespoons per egg white, so about 9 tablespoons total; beat a bit longer and add the cream of tartar or lemon juice to stabilize.

Pro Tips

1) Measure by weight and dont pack the flour. Spoon it into the cup or better yet use a scale. Cocoa should be sifted or at least whisked with the dry ingredients so no clumps hide in the batter. Overmixing makes cupcakes tough, so fold just until you see no streaks of flour.

2) Get the chocolate and coffee routine right: melt the chocolate and let it cool below hot to the touch before it meets the eggs, but keep the coffee hot when you add it to the melted chocolate so the cocoa flavor pops. If you rush and add very hot chocolate into the eggs you’ll get scrambled bits, trust me, been there.

3) Swiss meringue is picky, so use a spotless, grease free bowl and no yolk in the whites. Heat the whites and sugar to about 160 F or until you feel no sugar grit between your fingers, then whip to glossy stiff peaks. Add butter in small pieces while the mixer runs, and if the buttercream looks broken or curdled, dont toss it — keep whipping, or chill briefly and rewhip; most of the time it comes back.

4) Filling and finishing hacks: strain the blackberry purée if seeds bother you, and chill the mascarpone filling so it holds shape when you pipe it. Work on a cool counter, pop cupcakes in the fridge for 10 to 15 minutes if the buttercream softens while you pipe. Store refrigerated (because of eggs and mascarpone) and bring to room temp 20 to 30 minutes before serving so the flavors open up.

Dark Chocolate Cupcakes With Whipped Blackberry Mascarpone Filling Recipe

Recipe by Kate Sinclair

0.0 from 0 votes

Servings

servings

Calories

600

kcal

Equipment: 1. 12-cup muffin tin with paper liners
2. Oven (preheat to 350 F / 175 C)
3. Stand mixer or electric hand mixer (for Swiss meringue and buttercream)
4. Heatproof bowl and small saucepan for a double boiler to melt chocolate and warm the egg whites
5. Mixing bowls (at least 2) plus measuring cups and spoons
6. Whisk and rubber spatula for folding and scraping — dont overmix
7. Fine mesh strainer or sieve (optional) and a blender or fork to puree blackberries, remove seeds if you hate them
8. Piping bag with tips and a small offset spatula or spoon for filling and finishing
9. Cooling rack, toothpick or cake tester, and a small knife or apple corer to core the cupcakes

Ingredients

1 cup (125 g) all-purpose flour
3/4 cup (150 g) granulated sugar
1/2 cup (50 g) unsweetened cocoa powder, sifted
1 tsp baking powder
1/2 tsp baking soda
1/2 tsp fine salt
2 large eggs
1/2 cup (120 ml) buttermilk
1/3 cup (80 ml) vegetable oil
1/4 cup (60 g) sour cream or plain Greek yogurt
1/2 cup (120 ml) hot strong brewed coffee
3 oz (85 g) dark chocolate, finely chopped and melted, cooled
1 tsp vanilla extract
8 oz (225 g) mascarpone cheese
1 cup (140 g) fresh blackberries
1/2 cup (120 ml) heavy cream
3 tbsp (22 g) powdered sugar
1 tsp lemon juice
3 large egg whites
3/4 cup (150 g) granulated sugar
pinch fine salt
1 cup (225 g) unsalted butter, softened
3 oz (85 g) dark chocolate, melted and cooled
2 to 3 tbsp blackberry purée or seedless blackberry jam
1/2 tsp vanilla extract
1/8 tsp cream of tartar (optional)
1/2 cup chocolate curls or shavings
12 fresh blackberries for topping

Directions

Preheat oven to 350F (175C). Line a 12-cup muffin tin with liners. In a bowl whisk together 1 cup (125 g) flour, 3/4 cup (150 g) granulated sugar, 1/2 cup (50 g) unsweetened cocoa, 1 tsp baking powder, 1/2 tsp baking soda and 1/2 tsp fine salt. Set aside.
Melt and cool 3 oz (85 g) dark chocolate. In another bowl whisk 2 large eggs, 1/2 cup (120 ml) buttermilk, 1/3 cup (80 ml) vegetable oil, 1/4 cup (60 g) sour cream or plain Greek yogurt and 1 tsp vanilla until smooth. Stir in the cooled melted chocolate and 1/2 cup (120 ml) hot strong brewed coffee. Tip: hot coffee makes the chocolate flavor pop, but let the chocolate cool so it doesn't scramble the eggs.
Pour wet into dry and fold just until combined, scrape the bowl so no pockets of flour remain but do not overmix. Divide batter among liners about 2/3 full. Bake 18 to 22 minutes or until a toothpick comes out with a few moist crumbs. Cool completely on a rack before filling.
While cupcakes bake make the mascarpone filling. Blend or mash 1 cup (140 g) fresh blackberries to a coarse purée, strain if you hate seeds. Whip 1/2 cup (120 ml) heavy cream with 3 tbsp (22 g) powdered sugar to soft peaks. Gently fold in 8 oz (225 g) mascarpone, 1 tsp lemon juice and the blackberry purée until smooth and fluffy. Chill so it firms up, about 30 minutes.
Prepare Swiss meringue for the buttercream: in a heatproof bowl combine 3 large egg whites, 3/4 cup (150 g) granulated sugar, a pinch of fine salt and 1/8 tsp cream of tartar if using. Place over a simmering pot of water and whisk constantly until mixture is hot and sugar is dissolved, about 160F or until you feel no grit between your fingers.
Transfer the hot egg white mixture to a stand mixer and whip on high until cool and glossy stiff peaks form. With the mixer running add 1 cup (225 g) softened unsalted butter in small pieces, beating until silky. Add 3 oz (85 g) melted and cooled dark chocolate, 2 to 3 tbsp blackberry purée or seedless blackberry jam and 1/2 tsp vanilla extract, beat until fully incorporated and smooth. If buttercream looks loose chill briefly and rewhip. If it breaks, keep whipping and it will come back, honestly it usually does.
Core the cooled cupcakes with a small knife or apple corer leaving the bottom intact. Pipe or spoon the chilled mascarpone blackberry filling into each hole, then replace the little top you removed or leave open if you like.
Fit a piping bag with your favorite tip and pipe the blackberry dark chocolate Swiss meringue buttercream on each cupcake. Work on a cool surface so buttercream stays firm. If it gets too soft pop them in the fridge for 10 to 15 minutes and finish piping.
Finish by sprinkling 1/2 cup chocolate curls or shavings over the cupcakes and topping each one with a fresh blackberry. Store refrigerated because of the mascarpone and egg whites, but bring to room temp 20 to 30 minutes before serving so flavors shine.

Notes

Below you’ll find my best estimate of this recipe’s nutrition facts. Treat the numbers as a guide rather than a rule—great food should nourish both body and spirit. Figures are approximate, and the website owner assumes no liability for any inaccuracies in this recipe.