Prepare in a 13x9x2 pan.

Preheat oven to 425 degrees.

Cook broccoli. Add mayo, onion, cheese and soup & mix well. Pour into pan and spread evenly.

Melt 1 stick of butter and add 1 stack of Ritz crackers crushed. Mix until cracker crumbs are moist. Spread evenly over broccoli mixture.

Bake for 20-30 minutes until topping has been browned.