In a skillet over medium heat, sauté onion in butter; blend in flour, mustard, salt and pepper. Gradually add milk, stirring constantly until thickened; mix in 1-1/2 cups cheese and stir until melted. Remove from heat; add potatoes and toss to coat. Spoon into a greased 13"x9" baking dish; arrange ham and remaining cheese on top. Bake, uncovered, at 350 degrees for 30 minutes, until hot and bubbly.
This Scalloped Potatoes & Ham recipe is from the 101 Homestyle Favorites Cookbook. Download this Cookbook today.