In a large bowl, whisk together the 18 eggs. Add a splash of milk. Add salt and pepper to taste. We also used Spike seasoning, 1-2 teaspoons. If you don't have this, try Italian seasoning instead.

In a large skillet, saute the peppers and onion in a little bit of olive oil.  Add in the spinach for a minute or two. Pour the eggs in a greased 9 by 13 Pyrex dish. Add in the sauteed veggies and tomatoes. Stir everything in the pan. Stir in mozzarella cheese. Make sure everything is distributed evenly.

Bake in a 350 degree oven for about 35-40 minutes or until the eggs are set and golden.

Sprinkle the casserole with Parmesan cheese if you wish.