1/2 stick butter
1 c. flour
1 tsp. salt
1 lb. cheddar cheese, grated
1 sm. onion, chopped
1 sm. jar chopped mushrooms
3 lg. eggs
1 c. milk
1 tsp. baking powder
1 or 2 (10 oz.) boxes frozen chopped spinach, thawed, not cooked, water squeezed out

Melt butter. In a 9"x13" pan, mix remaining ingredients and pour over melted butter. Bake for 35 minutes at 350 degrees.