1. Preheat the Oven

Set your oven to 350°F (175°C). Prepare a standard 12-cup muffin tin with cupcake liners. This step ensures your batter will bake evenly and the cupcakes won’t stick.

2. Prepare Dry Ingredients

In a medium bowl, whisk together the flour, sugar, baking powder, baking soda, and salt. Set this bowl aside while you prepare the wet mixture.

3. Mix the Wet Ingredients

In a large mixing bowl, beat the softened butter until creamy using a hand mixer or stand mixer. Add the eggs one at a time, mixing thoroughly after each addition. Stir in the vanilla extract.

4. Combine Wet and Dry Mixtures

Add the dry ingredients to the wet mixture in three batches, alternating with the buttermilk. Start and end with the dry mix. Mix just until combined to avoid overworking the batter, which can result in dense cupcakes.

5. Choose Your Batter Style

Option 1: All-Chocolate Base

• Add cocoa powder to the entire batter.
• Fold in the melted dark chocolate.
• This yields rich, uniform chocolate cupcakes.

Option 2: Marbled Chocolate and Vanilla Base

• Divide the batter evenly into two bowls.
• In one bowl, mix in the cocoa powder and melted dark chocolate.
• In the second, fold in the melted white chocolate.
• Spoon about a tablespoon of the dark batter into each liner, followed by a spoonful of the white batter.
• Use a toothpick or skewer to gently swirl the two batters together.

6. Bake

Place the muffin tin in the center rack of your oven. Bake for 18–20 minutes, or until a toothpick inserted in the center comes out clean. Let cupcakes cool in the tin for 5 minutes before transferring them to a wire rack to cool completely.

7. Make the Frosting

Beat softened butter until smooth and creamy. Gradually add powdered sugar and mix on low to avoid a sugar cloud. Divide the frosting evenly into two bowls.

• In one bowl, add cocoa powder and melted dark chocolate.
• In the other, add melted white chocolate and vanilla.
• Add milk or cream to each, one teaspoon at a time, until the frosting reaches a pipeable consistency.

8. Frost the Cupcakes

Prepare a piping bag fitted with a large star tip. To create a marbled frosting effect, fill one side of the bag with dark chocolate frosting and the other side with white chocolate frosting. Pipe a swirl onto each cupcake. Each cupcake will have its own unique design.

9. Optional Decoration

For a finishing touch, lightly dust with edible gold flakes or a small amount of pearl powder. This adds elegance and a subtle shimmer, perfect for special occasions.