In a large skillet, saute onion and mushrooms
in oil until tender. Add spinach and ham; cook
and stir until the excess moisture is
evaporated. Cool slightly. Beat eggs; add
cheese and mix well. Stir in spinach mixture
and pepper; blend well. Spread evenly into a
greased 9-in. pie plate or quiche dish.
Bake at 350° for 40-45 minutes or until a knife
inserted in center comes out clean.