Crust less Quiche (Katie Gulbransen)

1 Tbs. oil
1 onion chopped
Spinach  (frozen or fresh)
5 eggs beaten
3 Cups Cheese (I used mozzarella)
1/4 tsp salt
1/8 tsp pepper

Saute onion and spinach.  Then mix all ingredients together.  Pour into dish and Bake 350* for 30 min.