Ingredients

• 1 1/2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1/4 teaspoon fine salt
• 2 large eggs, at room temperature
• 2/3 cup sugar
• 1 1/2 sticks (6 ounces) unsalted butter, melted
• 2 teaspoons pure vanilla extract
• 1/2 cup milk
• 2 tablespoons cocoa powder

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Instructions

1. Preheat the oven to 350 degrees F and position a rack in the middle of the oven. Line one 12-cup standard muffin tin with cupcake liners.
2. Whisk the flour, baking powder and salt together in a medium bowl.
3. In another medium bowl, beat the eggs and sugar with an electric mixer until light and foamy, about 2 minutes. While beating, gradually pour in the butter and then the vanilla.
4. While mixing slowly, add half the dry ingredients. Then add all the milk and follow with the rest of the dry ingredients. Take care not to overmix the batter.
5. Remove one-third of the batter (about 1 cup) and stir in the cocoa powder. Fill the liners evenly with yellow and chocolate batter, according to the marbling method you are following.
6. Bake until a tester inserted in the center of the cakes comes out clean, 18 to 20 minutes. Cool the cupcakes on a rack in the tin for 10 minutes, and then remove from the tin. Cool on the rack completely. Decorate as desired.