1 (6 oz.) box seasoned croutons
1 lb. cheddar cheese, grated
2 tbsp. flour

Mix and put in 9x13 buttered pan

Combine:
8 eggs (beaten)
3 c. milk
2 tsp. dry mustard
1/2 tsp. salt
2 tsp. dry onion (optional) Pour over crouton mixture

Bake uncovered at 350 degrees for 45 minutes. Or until knife comes out clean. Can be assembled day before. Refrigerate overnight.