4 cups sliced potatoes, sliced 1/2-inch thick (peeled or unpeeled – your choice)
2 cups diced ham
1/2 cup diced onion
6 tablespoons butter
3 tablespoons all-purpose flour
2 cups half and half (or whole milk)
2 cups shredded cheddar cheese
Salt and pepper to taste

Grease a 9 x 13-inch baking dish. Place sliced potatoes and diced ham in the baking dish.

In a saucepan, melt butter over medium-high heat, and cook the onions until they are translucent. Add the flour, and cook for about 5 minutes, or until the flour begins to turn a light brown color, stirring constantly to form a roux. Add the half and half (or milk) and the cheddar cheese, and stir until the mixture thickens. Add salt and pepper to taste.

Pour the cheese mixture over the potatoes and ham, and bake in a 350 degrees Fahrenheit oven for approximately 60 to 70 minutes, or until the potatoes test done, and the casserole is browned and bubbly.