Spinach Squares
["2 (10 oz.) pkg. fresh spinach", "4 Tbsp. softened butter or margarine", "1 c. flour", "1 tsp. salt", "1 tsp. baking powder", "12 to 16 oz. shredded Cheddar cheese", "3 eggs", "1 c. milk", "chopped onions (optional)"]
["Wash, cook and drain spinach well.", "Beat eggs well; add butter, flour, milk, salt and baking powder.", "Stir in grated cheese and cooked spinach.", "Place mixture in a 9 x 13-inch pan; level off.", "Bake in 350\u00b0 oven for 35 minutes.", "Remove from oven and cool for 45 minutes.", "Cut into squares and enjoy."]
["fresh spinach", "butter", "flour", "salt", "baking powder", "Cheddar cheese", "eggs", "milk", "onions"]