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Au Gratin Potatoes

Au Gratin Potatoes are a cheesy, creamy, delicious homemade side dish you need to try. Great for Thanksgiving, Christmas, Easter, or any day!
Course Side Dish
Cuisine American
Keyword Au Gratin Potatoes
Prep Time 20 minutes
Cook Time 1 hour 30 minutes
Servings 8 Servings
Calories 332kcal
Author Jen


  • 3 lb Potatoes peeled and thinly sliced
  • 1 medium Onion finely diced
  • 4 tbsp Butter
  • 4 tbsp Flour
  • 1/2 tsp Crushed Red Pepper
  • 1/4 tsp Rosemary
  • 1/2 tbsp minced Garlic
  • 2 1/4 cup Milk
  • 1/2 cup Sharp Cheddar Cheese shredded
  • 1/2 cup Parmesan Cheese shredded
  • 1/2 cup Gruyere Cheese shredded


  • Preheat oven to 400.
  • Heavily grease an 8x8" or 9x9" baking dish.
  • Layer potatoes in prepared baking dish/casserole, position upright to fit as many as possible.
  • In a medium saucepan, melt butter.
  • Add flour and combine to create a roux and cook about 3 minutes.
  • Add onions, red pepper, Rosemary and garlic. Stir until blended.
  • Gradually add milk and whisk over medium heat until thick and bubbling.
  • Remove from heat add in the cheeses until melted.
  • Pour cheese sauce over potatoes, wiggling and slightly moving potatoes, to get sauce between the slices.
  • Cover with foil and bake 60 minutes.
  • Remove the foil and bake for 20-30 minutes longer until potatoes are soft and browned.


Calories: 332kcal | Carbohydrates: 38g | Protein: 13g | Fat: 15g | Saturated Fat: 9g | Cholesterol: 43mg | Sodium: 265mg | Potassium: 846mg | Fiber: 4g | Sugar: 6g | Vitamin A: 523IU | Vitamin C: 35mg | Calcium: 313mg | Iron: 2mg