Mini Chocolate Frosted Funfetti Cakes

Name: Mini Chocolate Frosted Funfetti Cakes
Ingredients: 5 ounces 1 cup plus 3 tablespoons, spoon and level gluten-free baking flour (I used Bob’s Red Mill 1-to-1 Baking Flour); 3 tablespoons cornstarch or arrowroot powder; 1 teaspoon baking powder; ½ teaspoon xanthan gum omit if your flour contains it; 1/4 teaspoon baking soda; 1/4 teaspoon salt; 2 ½ ounces 5 tablespoons butter, room temperature; 5 1/4 ounces 3/4 cup granulated sugar; 1 teaspoon vanilla extract; 1/4 teaspoon almond extract; 3 egg whites; 5 2/3 ounces 2/3 cup buttermilk; 1/3 cup rainbow jimmies sprinkles