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Potato Ham Au Gratin

Potato Ham Au Gratin is the ultimate comfort food! Layers of thinly sliced potatoes, diced ham, caramelized onions and a dreamy cheese sauce!

Prep Time
30 mins
Cook Time
1 hr 30 mins
Total Time
1 hr 40 mins
Servings: 8
Calories: 480 kcal
Course: Main Course
Cuisine: American

Ingredients

  • 2½ pounds Yukon gold potatoes peeled and thinly sliced. (You can also use red skinned potatoes).
  • 1 pound leftover ham diced
  • 1 large onion diced
  • 3 tablespoons butter divided
  • 3 tablespoons flour
  • 1 teaspoon kosher salt
  • 1 teaspoon dry mustard
  • 1 teaspoon onion powder
  • ½ teaspoon white pepper
  • 3 cups milk
  • 1 teaspoon fresh thyme chopped
  • 2 cups shredded mozzarella or Italian blend cheese divided
  • 1 cup freshly grated Pecorino Romano divided

Instructions

    Cup of Yum
  1. Place the oven rack in the center of the oven and preheat the oven to 375° F.
  2. Spray a 2 quart casserole with vegetable spray
  3. In a large saucepan, melt butter over medium heat. Add the diced onions and sweat for 4-5 minutes until the onions are softened and translucent.
  4. Add the flour, salt, onion powder, dry mustard and pepper and stir constantly as it cooks and bubbles for about one minute. When there are no bits of dry flour or spices left, add the milk a little at a time, whisking after each addition until the milk is incorporated. Heat the sauce to a boil over medium high heat, stirring constantly. When the sauce begins to bubble cook for an additional minute, then remove from the heat. Stir in the chopped thyme.
  5. Add 1½ cups of the grated mozzarella and ¾ cup of the pecorino romano and stir until the cheese is completely melted.
  6. Add about a half cup of the sauce to the bottom of the casserole dish and spread evenly in the bottom.
  7. Arrange ⅓ of the potatoes, overlapping each other in the bottom of the dish. Sprinkle ½ of the ham cubes over the potatoes.
  8. Add ⅓ of the cheese sauce to the potatoes and gently spread with a spatula (doesn't have to be perfect).
  9. Add another layer of potatoes, ham and sauce followed by the remainder of the potatoes and sauce.
  10. Cover with a lid or aluminum foil and bake in the oven for 45 minutes.
  11. Reduce the heat to 350° and remove the lid or foil. Continue to bake for 20 minutes.
  12. Sprinkle on the remaining mozzarella and pecorino romano and bake for an additional 10-15 minutes or until the cheese is melted and browned.
  13. Let the casserole cool for about 10 minutes before serving.

Nutrition Information

Calories 480kcal (24%) Carbohydrates 35g (12%) Protein 29g (58%) Fat 25g (38%) Saturated Fat 13g (65%) Polyunsaturated Fat 2g Monounsaturated Fat 9g Trans Fat 1g Cholesterol 87mg (29%) Sodium 1373mg (57%) Potassium 952mg (27%) Fiber 4g (16%) Sugar 7g (14%) Vitamin A 481IU (10%) Vitamin C 30mg (33%) Calcium 485mg (49%) Iron 2mg (11%)

Nutrition Facts

Serving: 8Serving

Amount Per Serving

Calories 480

% Daily Value*

Calories 480kcal 24%
Carbohydrates 35g 12%
Protein 29g 58%
Fat 25g 38%
Saturated Fat 13g 65%
Polyunsaturated Fat 2g 12%
Monounsaturated Fat 9g 45%
Trans Fat 1g 50%
Cholesterol 87mg 29%
Sodium 1373mg 57%
Potassium 952mg 20%
Fiber 4g 16%
Sugar 7g 14%
Vitamin A 481IU 10%
Vitamin C 30mg 33%
Calcium 485mg 49%
Iron 2mg 11%

* Percent Daily Values are based on a 2,000 calorie diet.