Melt butter in small skillet on medium heat. Add cracker crumbs; cook 2-3 min. or until golden brown, stirring frequently. Cool completely. Stir in Parmesan cheese. Spoon in resealable plastic bag; seal bag. Store at room temperature up to 24 hrs.
Vent plastaic wrap covering broccoli mixture by poking a few holes in the top. Microwave on HIGH 5-6 min. or until heated through; stir. Sprinkle with cracker crumb mixture. Microwave, uncovered an additional 2-3 min. or until heated through.
Makes 12 1/2 C. servings.