Frosting:1/2 cup (1 stick) margarine or butter, softened1/4 cup milk2 tsp vanilla4 cups powdered sugar (more or less depending on how thick/runny you like it)A couple of drops blue food coloring (or any other color) to get desired blue color (optiona
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Combine all ingredients until well-blended. Spread on top of bars. Top with sprinkles if you want!