Spinach Squares
["4 Tbsp. butter or margarine", "3 eggs", "1 c. flour", "1 c. milk", "1 Tbsp. chopped onion", "1 tsp. salt", "1 tsp. baking powder", "3/4 lb. mild Cheddar cheese, grated", "2 pkg. chopped spinach, thawed, cooked, then drained well"]
["Melt butter in a 13 x 9-inch pan in oven.", "Beat eggs well with beater; add flour, milk, salt and baking powder.", "Mix well.", "Spoon into pan.", "Bake at 350\u00b0 for 30 to 35 minutes.", "Cool 45 minutes. Cut into bite size 3/4 to 1-inch squares.", "May be frozen."]
["butter", "eggs", "flour", "milk", "onion", "salt", "baking powder", "Cheddar cheese", "chopped spinach"]