INGREDIENTS
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1 recipe Perfect Chocolate Cake, baked in a 9x13 pan and cooled for the frosting: 1/2 cup softened salted butter 1/3 cup sifted cocoa powder 2 1/2 cups powdered sugar 1/2 teaspoon vanilla 1/2 cup sour cream for the 'carrots': 1/4 cup softened butter