4 tbsp. butter
3 eggs
1 c. flour
1 c. milk
1 tsp. salt
1 tsp. baking powder
1 lb. shredded Cheddar cheese
1 tsp. chopped onion
2 pkg. frozen chopped spinach, thawed and drained

Preheat oven to 350 degrees.

Put butter in 9x13 casserole and melt in oven. In large bowl, beat eggs well. Add flour, milk, salt and baking powder. Mix well. Add cheese, spinach, and onion. Mix well. Spoon into 9x13 casserole and level off. Bake at 350 degrees for 35 minutes. Let cool 45 minutes before cutting into squares.