Melt 3 tablespoons butter in 9 x 13 inch pan. 1 c. skim milk 1 tsp. baking powder 1 sm. onion, chopped 1 c. flour 1 tsp. salt 1 lb. shredded Swiss cheese 2 pkgs. frozen chopped spinach, squeezed dry

Mix together. Bake at 350 degrees for 35 to 40 minutes. Cool 1/2 hour before cutting into bars.