INGREDIENTS
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For the bars:
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2½ cups all-purpose flour
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½ tsp. baking powder
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½ tsp. salt
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½ cup (1 stick) unsalted butter, softened
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1 cup sugar
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1 egg
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1 tsp. vanilla extract
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For the frosting:
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½ cup (1 stick) unsalted butter, softened
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3¾ powdered sugar
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3-4 tbsp. milk
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2 tsp. vanilla extract
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Food coloring, if desired
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Sprinkles, if desired