Spinach Squares
["1 c. all-purpose flour", "1 tsp. salt", "1 tsp. baking powder", "2 eggs, beaten", "1 c. milk", "1/4 c. melted margarine", "1/2 c. chopped onion", "1 lb. shredded Cheddar cheese", "1 (10 oz.) pkg. frozen chopped spinach, thawed and drained"]
["In a large bowl, combine flour, salt and baking powder.", "Stir in beaten eggs, milk and butter.", "Add remaining ingredients and stir until moistened."]
["flour", "salt", "baking powder", "eggs", "milk", "margarine", "onion", "Cheddar cheese"]