Egg Casserole - cooking recipe

Ingredients

1/2 doz. eggs
1/2 lb. American cheese, slivered
1/4 lb. small cottage cheese
1 large onion, diced
1 small can mushrooms or fresh mushrooms, sliced
salt and pepper
1 Tbsp. white vinegar

Preparation

Mix everything in bowl.
Place in greased baking dish.
Bake at 400\u00b0 for 1/2 hour.
May be made night before.