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potatoes au gratin, au gratin potatoes, scalloped potatoes, potatoes, side dish, easy side dish, potatoes au gratin recipe, coco and ash
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Potatoes Au Gratin

Course Side Dish
Cuisine American
Prep Time 15 minutes
Cook Time 1 hour 30 minutes
Resting time 15 minutes
Total Time 1 hour 45 minutes
Author Coco and Ash

Ingredients

  • 3 pounds red potatoes
  • 1 and ¼ cup grated gruyere cheese
  • 1 and ¼ cup grated parmesan cheese
  • 1 small yellow onion (about ⅓ cup diced)
  • 2 cups heavy cream
  • 2 teaspoons salt
  • 1 teaspoon black pepper
  • 1 teaspoon garlic powder
  • 1 tablespoon fresh thyme leaves

Instructions

  • Pre-heat your oven to 400 degrees.
  • Slice your potatoes as thin as you can. I use this mandolin slicer but you can use a knife and cut them to about ⅛ inch thick. 
  • Mix your cheeses together and set aside ½ cup of cheese for the topping. 
  • In a large bowl, whisk together the remaining 2 cups of cheese, onion, cream, salt, pepper, garlic powder and thyme.
  • Add the potatoes to the mixture and toss to combine. The best tool for this is just your hands!
  • Grease a 9x13 baking dish with either butter or cooking spray and add in the potato mixture. 
  • Top the potatoes with the remaining ½ cup of cheese and cover the dish tightly with foil.
  • Bake for 1 hour then uncover the potatoes and bake for another 30 minutes or until the top is browned. 
  • Let the potatoes rest for 15 minutes before serving.