1/4 c. onions, chopped
6 tbsp. butter
1/4 c. flour
1 1/4 c. milk
2 c. shredded Cheddar cheese
1 (10 oz.) pkg. frozen spinach, drained
5 lg. cooked potatoes
1 lb. franks, cut into 1/2" pieces

Melt butter. Cook onion until limp. Add flour. Add milk and cook, stirring constantly until mixture thickens. Add 1 1/2 cups cheese. Stir until melted. Stir in spinach.

Arrange half slied potatoes in 11 3/4 x 7 1/2 inch baking dish. Top with half the franks and half spinach and half sauce. Repeat layers. Cover and bake at 350 degrees for 45-50 minutes. Top with remaining cheese. Bake until melted. 6-8 servings.