Grease 8x11 baking dish with butter or cooking spray.
Microwave in large glass bowl, stirring every 30 seconds: 1/2 T butter, 1 T peanut butter, 13 marshmallows. Once melted, stir in 2 C Rice Krispies. Set aside to cool slightly.
Microwave in large glass bowl, stirring every 30 seconds: 1/2 T butter, 1 T peanut butter, 13 marshmallows. Once melted, stir in a few drops of blue food coloring. Stir in 2 C Rice Krispies. Press firmly into pan. This will be your first layer!
Once slightly cooled, stir in 1 C Red, White, and Blue M&Ms. Press firmly into pan on top of blue layer.
Microwave in large glass bowl, stirring every 30 seconds: 1/2 T butter, 1 T peanut butter, 13 marshmallows. Once melted, stir in a few drops of red food coloring. Stir in 2 C Rice Krispies. Press firmly into pan on top of white layer. Let cool until set, 15-20 minutes.
Slice and enjoy OR flip treats out onto cookie sheet and cut with star shaped cookie cutter (molding with hands to correct shape if necessary).