Spinach Brownies

Don't let the title fool you! These are NOT for dessert...but they ARE delicious!

Saute the following in 2 Tablespoons of butter:
* 1 package frozen spinach, thawed and drained
* 1 diced onion
Set aside

Combine the followin dry ingredients in a large mixing bowl:
* 1 cup sifted flour (mom doesn't sift)
* 1 teaspoon baking soda
* dash of salt
Set aside

Mix together the following wet ingredients:
* 2 eggs
* 1 cup milk
* 1/2 cup melted butter (mom suggests using only 1/4 cup melted butter or less)
Add the wet ingredients (not the spinach and onion) to the dry ingredients and stir

Add the sauteed spinach and onion along with 2 cups grated cheddar and 2 cups grated mozzarella cheese to the batter (you can use low-fat varieties of cheese if you like).

Spray a 9X13 inch pan with cooking spray, spread batter into pan, and bake at 350 degrees for 30-35 minutes.