Crockpot Broccoli Casserole

2x12 oz. bags frozen chopped broccoli
1 1/2 c. ritz crackers, crushed, divided
6 oz. velveeta cheese, cubed
2 T. butter, cut in chunks

Place frozen broccoli in lined crockpot. Stir in 1 c. crackers. Place layer of cheese cubes on top. Add butter pieces. Place layer of paper towels under lid to keep crackers from getting soggy. Cover and cook on low for 4 hours.