1 pkg. frozen, chopped broccoli
1 can cream of mushroom soup
1 c. crushed Ritz crackers
1 egg, well beaten
1 tbsp. grated onion
1 c. grated sharp cheese
1 c. sour cream
Salt to taste
Pepper to taste
1 sm. can water chestnuts, sliced
1/2 c. mayonnaise

Preheat oven to 400 degrees. Mix all ingredients, reserving enough cheese and crackers to top casserole. Bake for 30 minutes.