How to Make Parmesan-Gruyre Potato Gratin

To save time on prep, assemble and bake this side three days ahead, then reheat at 375F for 15 minutes. 8 15 min. 1 hrs.

To save time on prep, assemble and bake this side three days ahead, then reheat at 375°F for 15 minutes.

Serving Size:

8

Active Time:

15 min.

Total Time:

1½ hrs.

Ingredients

  • ½ stick butter
  • 1 Tbs. flour
  • 1 tsp. garlic powder
  • 1 tsp. onion powder
  • 2 cups milk
  • 1 Tbs. minced fresh thyme
  • 4 baking potatoes, peeled and sliced into ¼”-thick rounds 
  • 1 cup grated Parmesan cheese
  • ½ cup grated Gruyère cheese
  • 1 bunch fresh chives, sliced

Instructions

  • Heat oven to 400°F. In pan over medium heat, melt butter. Whisk in flour, garlic powder and onion powder until smooth. Whisk in milk. Let simmer 5 min. or until thickened, whisking occasionally. Stir in thyme.
  • Spread ¼ of the potato slices in bottom of 9″x13″ greased casserole dish. Ladle ½ cup milk mixture over top; sprinkle with ¼ cup Parmesan cheese and 2 Tbs. Gruyère. Repeat layering of cream sauce, potatoes and cheese 3 times. Cover with foil; bake 1 hr., uncovering during last 10 min. Garnish with chives as desired.
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