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Mocha Swiss Meringue Buttercream Cupcakes

These Mocha Swiss Meringue Buttercream Cupcakes feature incredibly moist chocolate cupcakes topped with silky, fluffy coffee Swiss meringue buttercream. The chocolate cupcakes are rich and deeply flavoured, while the buttercream adds a creamy coffee sweetness that perfectly balances every bite. Finished with shaved chocolate, these bakery-style cupcakes are perfect for birthdays, celebrations, or whenever you're craving an indulgent chocolate dessert.
Print Recipe
Prep Time 40 minutes
Cook Time 20 minutes
cooling 30 minutes
Total Time 1 hour 30 minutes
Servings: 9 cupcakes
Course: Dessert
Ingredients Method Notes

Ingredients
  

Chocolate Cupcakes
  • 250 ml water 1cup
  • 150 g granulated sugar ¾ cup
  • 30 g Dutch-processed cocoa powder ⅓ cup
  • 6 g instant coffee powder 2 tsp
  • 50 g dark chocolate chopped (about ⅓ cup)
  • 10 ml vanilla extract 2 tsp
  • 20 g unsalted butter room temperature (1½ tbsp)
  • 100 g all-purpose flour ¾ cup + 1 tbsp
  • ½ tsp baking soda
  • Pinch salt
  • 35 g neutral oil 3 tbsp
  • 2 large eggs room temperature
Mocha Swiss Meringue Buttercream
  • 103 g egg whites room temperature (about 3 egg whites)
  • 154 g granulated sugar ¾ cup
  • 200 g unsalted butter softened (¾ cup + 2 tbsp)
  • 12 g instant coffee powder 4 tsp
  • 5 g Dutch-processed cocoa powder 2 tsp
Garnish
  • Shaved dark chocolate

Method
 

Chocolate Cupcakes
  1. Preheat the oven to 180°C (350°F). Line a standard cupcake tray with 9 cupcake liners.
  2. In a medium saucepan, combine the water, sugar, Dutch cocoa powder, instant coffee powder, chopped dark chocolate, vanilla extract, and butter.
  3. Place the saucepan over medium heat, whisking occasionally until the butter and chocolate melt completely.
  4. Bring the mixture to a gentle boil and continue cooking until it visibly reduces slightly and thickens. This concentrates the chocolate flavour and creates an extra moist cupcake.
  5. Remove the saucepan from the heat and allow the mixture to cool for several minutes.
  6. Meanwhile, whisk together the flour, baking soda, and salt in a large mixing bowl.
  7. Pour the warm chocolate mixture into the dry ingredients and whisk gently until almost smooth.
  8. Add the oil and room-temperature eggs. Whisk just until the batter is smooth and fully combined. Avoid overmixing.
  9. Divide the batter evenly between the cupcake liners, filling each about ¾ full.
  10. Bake for 18–20 minutes, or until a skewer inserted into the centre comes out clean or with a few moist crumbs.
  11. Leave the cupcakes in the pan for 10 minutes, then transfer them to a wire rack to cool completely before decorating.
Mocha Swiss Meringue Buttercream
  1. Add the egg whites and sugar to a clean, grease-free heatproof bowl.
  2. Place the bowl over a saucepan filled with gently simmering water, ensuring the bottom of the bowl does not touch the water.
  3. Whisk continuously until the mixture reaches 65–70°C or until the sugar has completely dissolved. Rub a small amount between your fingers—it should feel perfectly smooth without any sugar crystals.
  4. Remove from the heat and let the mixture cool for about 5 minutes.
  5. Beat on medium-high speed until the meringue reaches soft to stiff peaks and the outside of the bowl feels almost at room temperature.
  6. Add the softened butter gradually in 3–4 additions, beating well after each addition.
  7. The buttercream may look curdled or separated during mixing. Continue beating until it becomes smooth, creamy, and fluffy.
  8. Add the instant coffee powder and cocoa powder. Beat until fully incorporated and silky.
Assemble
  1. Transfer the buttercream to a piping bag fitted with your preferred piping tip.
  2. Pipe generous swirls of buttercream onto the completely cooled cupcakes.
  3. Garnish with shaved chocolate, chocolate curls, cocoa powder, or chocolate-covered espresso beans.
  4. Serve immediately or store until ready to enjoy.

Notes

Storage

  • Store at room temperature for up to 6–8 hours in a cool environment.
  • Refrigerate in an airtight container for up to 4 days.
  • Freeze unfrosted cupcakes for up to 3 months.
  • Buttercream can be frozen separately for up to 2 months.

Make Ahead

  • Bake the cupcakes 1–2 days in advance.
  • Prepare the buttercream up to 1 week ahead and refrigerate.
  • Bring the buttercream back to room temperature and rewhip before piping.

Tips & Tricks

  • Use room-temperature eggs for a smoother batter.
  • Reduce the chocolate mixture properly for maximum flavour.
  • Wait until the meringue has cooled before adding butter.
  • If the buttercream curdles or becomes soupy, keep beating—it will come together.
  • Weigh your ingredients for the most accurate results.
  • Don't overbake the cupcakes to keep them moist.