Saute onion in tablespoon butter, ... until thickened. Add cheese. Stir until melted. Stir ... overnight. Bake uncovered at 350 degrees for 45 minutes.
Saute onion in 1 tablespoon ... until thickened. Add cheese, stirring until melted. Stir ... casserole. Bake at 350 degrees for 30 minutes. 8 servings.