Ingredients
Method
- Preheat oven to 350 degrees F. Set out a 9x13 casserole dish.
- Wash and slice potatoes into 1/8-inch thick slices. Place in cold water while prepping sauce.
- Melt butter in a saucepan over medium heat. Add garlic and cook until fragrant. Mix in cream, milk, and seasonings.
- Layer half of the potatoes in the dish. Pour half of the cream mixture over potatoes and sprinkle with 1 cup of Gruyere cheese.
- Layer the second half of the potatoes and top with the remaining cream mixture. Do not add cheese yet.
- Cover pan tightly with foil.
- Bake 40-45 minutes, then uncover.
- Top with remaining Gruyere and Parmesan cheese.
- Bake another 40-45 minutes until golden brown and potatoes are fork tender. Broil 1-2 minutes for a darker top if desired.
- Let cool 5-10 minutes before serving. Garnish with parsley or thyme.
- Serve and store leftovers covered in the fridge for 2-3 days.
Notes
For best results, use a mandoline to slice the potatoes thinly and evenly. This ensures they cook uniformly.
