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Easy Au Gratin Potatoes ~ layers of tender potatoes in a creamy, cheesy sauce and golden brown slightly crispy top. A classic comfort food side dish.
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4.10 from 11 votes

Au Gratin Potatoes

Au Gratin Potatoes ~ easy recipe for homemade cheesy au gratin potatoes. 
Prep Time15 minutes
Cook Time1 hour
Total Time1 hour 15 minutes
Course: Side Dish
Cuisine: American
Keyword: scalloped potatoes, au gratin potatoes, cheesy potatoes, easter side dishes
Servings: 4
Calories:

Ingredients

  • 4 tablespoons butter divided
  • 4 cups russet potatoes thinly and evenly sliced
  • 3 tablespoons flour
  • 2 cups whole milk
  • 1 teaspoon lemon zest
  • 2 cloves garlic grated
  • 1 teaspoon fresh thyme finely minced
  • 1/2 cup onions finely chopped
  • 1 teaspoon salt or to taste
  • 1 cup white cheddar cheese shredded
  • 1 cup smoked gouda shredded

Instructions

  • Preheat the oven to 375° then butter a 2 quart baking dish using one tablespoon of the softened butter.
  • Peel and thinly slice the potatoes then set them aside then shred the cheeses and combine in a small bowl.
  • In a small sauce pan melt the remaining 3 tablespoons of butter then sprinkle in the flour and cook 1 minute. Whisk in the milk then add the lemon zest, grated garlic, thyme, onions and salt. Simmer 2-3 minutes or until the sauce is smooth, stirring occasionally and allowing the sauce to thicken. 
  • Reduce the heat and stir in 1 1/2 cups of the cheeses.
  • Place half of the potatoes in the buttered baking dish overlapping them, then pour half of the cheese sauce over the top.
  • Repeat with a second layer of overlapping potatoes and the remaining cheese sauce then sprinkle the remaining grated cheese. Bake uncovered 45-60 minutes or until the potatoes are tender and lightly golden.