MELT THE BUTTER IN THE MICROWAVE IN A BOWL. STIR IN SUGAR AND CRUMBS. LINE AN 8 INCH PAN WITH NONSTICK FOIL AND PRESS THE CRUMB MIXTURE IN. BAKE ABOUT 9 MINS AT 350 AND LET COOL. ONCE COOL, LINE THE CRUST WITH SNACK SIZE PEANUT BUTTER CUPS TO COVER THE BOTTOM.