Baked Omelet Squares

I may try selling Chris and the kids on breakfast for dinner.  We all like breakfast...I've just never served it for dinner for them before.  This would be easy enough to serve with some bacon and English muffins.

1/4 C. butter
1 small onion, chopped
1 1/2 C. shredded cheddar cheese
1 12oz. can sliced mushrooms
1 6oz. can sliced black olives (Might have to omit these, not too many fans in the family!)
Chopped cooked ham, optional
sliced jalepeno peppers, optional
12 eggs, scrambled
1/2 C. milk
1/2 tsp. salt and pepper, to taste

Preheat oven to 400 degrees.  Grease a 9x13 inch baking dish.

Melt the butter in a skillet over medium heat, can cook the onion until tender.

Spread cheddar cheese in the bottom of the prepared baking dish.  Layer with mushrooms, olives, sauteed onion, ham, and jalepeno peppers.  In a bowl, scramble eggs together with milk, and season with salt and pepper.  Pour egg mixture over ingredients but do not stir.

Bake, uncovered, in the preheated oven for 30 minutes, or until no longer runny in the center and slightly brown on top.  Allow to cool slightly, then cut into squares and serve.