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Dad’s Creamy & Cheesy Au Gratin Potatoes

Rich, creamy, and loaded with melted cheese, these homemade au gratin potatoes are the perfect comfort food side dish for family dinners and holidays.
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Prep Time 20 minutes
Cook Time 1 hour 15 minutes
Total Time 1 hour 35 minutes
Servings: 8 servings
Course: Dinner, Side Dish
Cuisine: American, Comfort Food
Calories: 410
Ingredients Equipment Method Notes

Ingredients
  

Potato Casserole
  • 6 russet potatoes peeled and thinly sliced
  • 3 tbsp unsalted butter
  • 1 yellow onion finely diced
  • 3 cloves garlic minced
  • 3 tbsp all-purpose flour
  • 2 cups whole milk
  • 1 cup heavy cream
  • 2 cups sharp cheddar cheese shredded
  • 1 cup mozzarella cheese shredded
  • 1 tsp salt
  • 0.5 tsp black pepper
  • 0.5 tsp paprika
  • 1 tbsp fresh parsley chopped

Equipment

  • Mixing bowls
  • 9x13 baking dish
  • Saucepan
  • Whisk

Method
 

  1. Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish.
  2. Melt butter in a saucepan over medium heat. Cook onion until softened, then add garlic.
  3. Whisk flour into the butter mixture and cook for 1 minute.
  4. Slowly whisk in milk and heavy cream until smooth and slightly thickened.
  5. Reduce heat and stir in cheddar and mozzarella cheese until melted.
  6. Season sauce with salt, pepper, and paprika.
  7. Layer half of the sliced potatoes in the baking dish and cover with half the cheese sauce.
  8. Repeat with remaining potatoes and sauce.
  9. Cover with foil and bake for 45 minutes.
  10. Remove foil and bake another 25–30 minutes until golden and bubbly.
  11. Rest for 10 minutes, garnish with parsley, and serve warm.

Notes

Freshly shredded cheese melts best and creates the creamiest sauce. Allow the casserole to rest before serving for cleaner slices.