Method Cream the butter and sugar in the bowl of an electric mixer with the paddle attachment on high speed, until light and fluffy. Lower the mixer to medium, add the eggs, 1 at a time, then add the sour cream and vanilla. Scrape down the sides and stir until smooth. Sift the flour, cornstarch, salt, and baking soda together in a bowl. With the mixer on low speed, add the flour mixture to the butter mixture until just combined. Fill the cupcake liners to the top with batter. Bake in the center of the oven for 20 to 30 minutes, until a toothpick comes out clean. Cool to room temperature before you top with icing.
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