Potatoes Au Gratin
Potatoes Au Gratin are russet potato rounds smothered with a creamy cheese sauce and topped and baked with even more cheese.
Servings: 12
Calories: 196kcal
Ingredients
- 3 pounds (approximately 8-10 medium) russet potatoes, rinsed, peeled, and thinly sliced with a mandoline
- 6 tablespoons unsalted butter
- ½ yellow onion, diced
- ½ cup all-purpose flour
- 2 teaspoons kosher salt
- ½ teaspoon pepper
- 3 cups whole milk, room temperature
- 2 cups sharp cheddar cheese, shredded and divided
- parsley, for garnish
Instructions
- Preheat oven to 375°F and spray a 9x13-inch baking dish with cooking spray.
- In a medium saucepan, melt the butter and diced onion over low heat until the onion is softened (3-5 minutes). Then add the flour, salt, and pepper. Cook for 1 minute.
- Slowly drizzle in milk, whisking constantly. After adding the milk, continue cooking until the mixture thickens, 5-8 minutes, whisking frequently.
- Remove from heat and stir in 1 cup of cheese. Continue stirring until the cheese is melted and smooth, about 30 to 60 seconds. Set aside.
- Carefully set the potato slices in the bottom of the prepared baking dish (trying to keep the shape of the potato together), and fan them out in a single layer.
- Top the potatoes with the cheese sauce and the remaining cup of shredded cheese.
- Cover with aluminum foil and bake for 60 minutes, or until the potatoes are fork-tender.
- Remove the foil and broil for 2-3 minutes, or until brown, watching carefully.
- Serve hot, garnished with parsley. Add salt and pepper to taste.
Nutrition
Calories: 196kcal