package (18.25 ounces) any flavor cake mix, plus ingredients to prepare mix
1/4
cup (1/2 stick) butter, softened
2-1/2
cups powdered sugar, divided
2
to 3 tablespoons milk
1/4
teaspoon vanilla extract
Blue food coloring
1-1/2
cups "M&M's"® Chocolate Mini Baking Bits
Prepare and bake cake as directed on package for 13×9-inch cake. Cool cake completely on wire rack. In large bowl beat butter until light. Add 1-1/4 cups powdered sugar; beat until fluffy. Blend in milk and vanilla. Beat in remaining 1-1/4 cups powdered sugar until frosting is smooth. Add enough food coloring to make frosting dark blue. Frost cake and decorate with "M&M's"® Chocolate Mini Baking Bits to look like exploding fireworks.
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