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Easy Creamy Au Gratin Potatoes

Prep Time 10 minutes
Cook Time 1 hour 30 minutes
Total Time 1 hour 40 minutes
Servings 8
Author Melissa


  • 3 tablespoons butter
  • 3 tablespoons flour
  • 1 teaspoon salt
  • 1/8 teaspoon pepper
  • 2 cups milk
  • 1 1/2 cups shredded cheddar cheese
  • 5 cups thinly sliced peeled potatoes about 6 medium
  • 1/2 cup chopped onion


  • Preheat oven to 350°.
  • In a large pan, melt butter over low heat. Whisk in flour, salt and pepper until smooth. Gradually add milk. Bring to a boil. Cook, continually stirring for 2 minutes or until thickened. Remove from heat. Add the cheese and stir until melted. Add potatoes and onion and stir until coated with cheese mixture.
  • Spray a 9x12 baking dish with non-stick spray. Add potatoes to the baking dish. Cover and bake 1 hour. Uncover; bake 20-30 minutes or until the potatoes are tender.