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1
Preheat the oven to 350u00b0F Spray 18 cupcake tins with Pam; fill with paper liners and spray with Pam again.
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2
To make the batter, cream the butter and sugar at high speed in a large bowl until light and fluffy. On medium speed, add the eggs one at a time, then add the sour cream and vanilla. Stir together the flour, cornstarch, salt and baking soda in a bowl. With the mixer on low speed, add the flour mixture to the butter mixture until just combined.
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3
Fill each prepared paper-lined muffin tins about 2/3 full with the batter, and fill any empty tins with a little water. Bake in the center of the oven for about 20-25 minutes, until a toothpick comes out clean. Let cool before icing.
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4
To make the icing, beat together the butter, cream cheese, powdered sugar and vanilla just until smooth.
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5
Spread the icing onto each cupcake, and top half with 3 raspberries in a little group, and top the other half with 4 blueberries in a little square. You can also experiment with other berries or fruit, such as blackberries, figs, diced peaches or diced strawberries.
