Spinach Squares - cooking recipe

Ingredients

1 c. flour
1 tsp. salt
1 tsp. baking powder
1 medium onion, chopped
12 oz. grated Cheddar
1 pkg. chopped spinach, drained
1 c. milk
1/4 lb. butter, melted

Preparation

Combine the first 3 ingredients, then mix in all the rest. Spread in a 9 x 13-inch pan. Bake at 350\u00b0 for 45 minutes or less. Cool and cut.
Can be reheated in microwave.