Broccoli Casserole

3 sleeves of crushed Ritz crackers
2 sticks of margarine
4 small boxes frozen broccoli (chopped)
1 lb. box Velveeta Cheese

Cook broccoli for half the time stated on package. Drain well, and add 3/4 stick of margarine, 4 handfuls of crushed crackers and cheese cut into 1 inch cubes. Mix well and spread into greased baking dish. Melt remaining margarine and add to remaining crackers. pack lightly over broccoli mixture. Bake uncovered at 350 degrees for 30 minutes.