INGREDIENTS
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For the bars: 1 1/3 cups packed brown sugar 1/4 cup butter, melted 1/2 cup creamy peanut butter 1 tsp vanilla 3 eggs 1 1/2 cups all-purpose flour 3/4 tsp baking powder 1/4 tsp baking soda 1/2 tsp salt For the frosting: 1/2 cup butter, softened 1/2 cu