4 tbsp. butter, melted
3 lg. eggs
1 c. flour
1 c. milk
1 tsp. salt
1 tsp. baking powder
1 lb. grated Cheddar cheese
10 oz. pkg. frozen chopped spinach, thawed but not cooked and water squeezed out
1 sm. onion, finely minced
6 med. mushrooms, chopped

Melt butter in a 9x13 inch pan. In a mixing bowl mix up eggs, 1 cup each of flour and milk, salt and baking powder, grated Cheddar cheese (the better the Cheddar the better the bars), spinach, onion and mushrooms. Pour mixture over melted butter and bake in a 350 degree oven for 35 minutes. Let cool a bit before cutting.