Here is an easy recipe for Au Gratin Potatoes and Ham. My Mother used to make a similar recipe. Begin by slicing up some onion, ham and potato. Layer the ham and potatoes in a casserole dish that has been lightly greased before. Preheat oven to 350F. In large skillet, melt 1/3 cup butter, saute onions and then add only onions to ham and potatoes. Add 3 T flour to butter and stir until combined and turns a nice brown color. Slowly add your milk about 3 cups, stirring all the while. When mixture bubbles and thickens add 2 cups of cheddar cheese. Pour over potatoes and ham and mix in. Bake in oven until its bubbly and potatoes are tender! Enjoy!