Casseroles are usually meal-in-one combinations of two or more ingredients, baked and served in the same dish. They usually contain meat, fish or poultry; rice, pasta or potatoes; vegetables and seasonings, as well as a sauce or gravy. 1. Broccoli Frittata Casserole Ingredients: 2 potatoes, sliced 1/8 inch thick 1 1/2 cups broccoli 1 onion, [...]