Spinach Brownies
["1 c. flour", "1 tsp. salt", "1 tsp. baking powder", "1 pkg. frozen, chopped spinach, thawed and drained", "1 c. milk", "1/4 lb. butter, melted and cooled", "1/2 c. chopped onion", "8 oz. grated Cheddar cheese", "2 eggs, beaten"]
["Add beaten eggs, butter and milk to dry ingredients.", "Add other ingredients.", "Mix and pour into 9 x 13-inch pan.", "Bake at 350\u00b0 for 30 to 35 minutes.", "Cool; cut into squares.", "Freeze.", "To use, thaw and reheat at 350\u00b0 for 10 to 12 minutes."]
["flour", "salt", "baking powder", "frozen", "milk", "butter", "onion", "Cheddar cheese", "eggs"]