Ham Potato Au Gratin Recipe

This delicious Ham Potato Au Gratin recipe is easy to make and the sort of comfort food your family will crave again and again. The satisfying casserole of gratin potatoes is creamy and rich, with plenty of melted cheese and is a great way to use up leftover ham.

The casserole features tender potatoes and ham smothered in a cheesy sauce and is equally suited for special occasions like holiday dinners, casual meals or potlucks. Adding ham to the au gratin potatoes makes the dish fit for a meal, but the casserole still works as a side dish too! You really can't go wrong with this casserole.

How to Make Ham and Potatoes au Gratin

Let's make this hearty au gratin potatoes with ham casserole together. Follow along here for step-by-step instructions to make it along with pictures or skip right down to the printable recipe card if you prefer.

The recipe makes 6 servings.

Prep Time: 20 mins | Cooking Time: 1 hour 10 mins

Ingredients for Ham and Potato au Gratin Casserole

Here is everything you will need to make this cheesy potato and ham casserole.

• 4 cups peeled and thinly sliced potatoes (preferably Yukon Gold or Russet potatoes)
• 1 ½ cups diced ham
• ¼ cup unsalted butter
• ¼ cup all-purpose flour
• ½ teaspoon salt
• ¼ teaspoon black pepper
• ¼ teaspoon garlic powder
• ¼ teaspoon onion powder
• 2 cups milk
• 1 ½ cups shredded sharp cheddar cheese divided
• ½ cup grated Parmesan cheese
• Fresh parsley chopped (for garnish)

Preparation

Preheat the oven to 375°F (190°C). Coat the interior of a 9x13-inch baking dish with butter or non-stick cooking spray.

Make the Cheesy Cream Sauce

In a medium saucepan over medium heat, melt the butter.

Stir in the flour, salt, pepper, garlic powder, and onion powder. Cook, stirring constantly, until the mixture is bubbly. Gradually whisk in the milk, and continue cooking and stirring until the sauce thickens.

Remove the saucepan from the heat and stir in 1 cup of shredded cheddar cheese and all of the grated Parmesan cheese. Mix until the cheese is melted and the sauce is smooth.

Assemble the Casserole

Create a layer of the thinly sliced potatoes and diced ham.

Pour about ¼ of the cheese sauce over the potatoes and ham layer.

Repeat the layers ending with the remaining cheese sauce.

Sprinkle the remaining ½ cup of shredded cheddar cheese over the top.

Bake

Cover the baking dish with foil and bake in the preheated oven for 45 minutes. Then, remove the foil and bake for an additional 15-20 minutes or until the potatoes are tender and the top is golden brown and bubbly.

Remove from the oven and let it cool for a few minutes before serving. Garnish with chopped fresh parsley if desired. A dollop of seasoned sour cream would be a tasty topping too.

Serving

The casserole serves well as a main course. Teaming it with a green salad with a red wine vinaigrette or ranch dressing and bread, such as my pretzel rolls makes it a satisfying dinner. A soup such as my Olive Garden Minestrone Soup or Turkey Vegetable Soup would also make a great start.

In smaller portions, the casserole can also serve as a side dish. It would be a great side for Broccoli Cheese Stuffed Chicken Breast, Blackened Salmon or Air Fryer Chicken Drumsticks just to name a few options.