Yellow Cupcakes: Preheat oven to 350 degrees F (177 degrees C) and lightly butter or line 12 muffin cups with paper liners.

In the bowl of your electric mixer, or with a hand mixer, beat to combine the flour, sugar, baking powder, and salt. Add the butter, egg, egg yolks, vanilla extract, and sour cream. Beat the wet and dry ingredients together at medium speed until the batter is smooth and satiny, about 30 seconds. Scrape down the sides of the bowl. If necessary, stir the batter with a rubber spatula until the flour is fully incorporated.

Evenly fill the muffin cups with the batter and bake for about 20-25 minutes or until pale gold and a toothpick inserted into a cupcake comes out clean. Remove from oven and place on a wire rack to cool. Once the cupcakes have completely cooled, frost with icing. You can either spread the frosting on the cupcakes with a small spatula or, if piping, use a large Wilton 1M open or closed star tip to make lovely swirls. These cupcakes are best the day they are made, although they will keep for a few days at room temperature.

Chocolate Frosting: Melt the chocolate in a heatproof bowl placed over a saucepan of simmering water. Remove from heat and let cool to room temperature.

In the bowl of your electric mixer, or with a hand mixer, beat the butter until smooth and creamy (about 1 minute). Add the sugar and beat until it is light and fluffy (about 2 minutes). Beat in the vanilla extract. Add the chocolate and beat on low speed until incorporated. Increase the speed to medium-high and beat until frosting is smooth and glossy (about 2 -3 minutes).

Makes 12 cupcakes

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