1/2 c. chopped onion
1/4 c. Crisco
1/4 c. flour
1 tsp. salt
2 c. milk
1 c. (4 oz.) shredded process American cheese
1 tbsp. prepared mustard
1/2 lb. frankfurters
3 c. sliced potatoes

In saucepan, cook onion in hot Crisco until tender; stir in flour and salt. Add milk; cook and stir over low heat until thickened and bubbly. Remove from heat; stir in cheese and mustard. Cut frankfurters in 1/4" slices. In greased 2 quart casserole, arrange layers of half the potatoes, frankfurters and cheese sauce; repeat layers. Bake at 325 degrees for 1 1/4 hours. Makes 6 to 8 servings.