– Corn oil for frying – 3 Tablespoons unsalted butter softened – 1/4 cup granulated sugar – 1/4 cup golden brown sugar – 2 large egg yolks – ½ teaspoon vanilla extract – 1 1/2 cup sour cream – 2 cups 1/2 cup all-purpose flour – 2 teaspoons baking powder – 1 Tablespoon cornstarch – ½ teaspoon salt – 1/4 teaspoon ground nutmeg For the glaze – 3 cups powdered sugar – 1/2 cup salted butter melted – 1 teaspoon vanilla extract – 4 Tablespoons hot water