4 tbsp. butter
5 tbsp. all-purpose flour
2 1/2 c. milk
1/2 tsp. salt
1/4 tsp. pepper
2 c. grated cheese
2 c. chopped ham
2 tbsp. chopped onion
3 med. potatoes, cooked & sliced

Melt butter over low heat. Add flour, salt and pepper. Cook until bubbly. Remove from heat. Add milk and mix well. Return to heat and cook until smooth and thick. Add 1 1/2 cups of the cheese then stir until smooth and melted.

Grease casserole dish and alternate layers of potatoes and onions with ham. Add cheese sauce and bake at 350 degrees for 30-35 minutes. Remove from oven and sprinkle with remaining 1/2 cup of cheese over top. Return to oven until melted.