Spinach Squares - cooking recipe

Ingredients

1 cup flour
1 teaspoon salt
1 teaspoon baking powder
1 cup milk
1/2 cup melted butter
1/2 cup finely chopped onion
1 lb grated sharp cheddar cheese
2 eggs
1 (10 ounce) frozen chopped spinach (drain, thaw)

Preparation

Mix all ingredients.
Pour mixture in a 9x13 greased pan.
Bake 30-35min @ 350\u00b0.
Let cool for about 30 minutes
Cut into squares and serve.