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Dad’s Creamy & Cheesy Au Gratin Potatoes Recipe

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.2 from 238 reviews
  • Author: Kimberly
  • Prep Time: 20 minutes
  • Cook Time: 1 hour 15 minutes
  • Total Time: 1 hour 35 minutes
  • Yield: 6 servings
  • Category: Side Dish
  • Method: Baking
  • Cuisine: American
  • Diet: Vegetarian

Description

Dad’s Creamy & Cheesy Au Gratin Potatoes is a comforting baked side dish featuring thinly sliced Yukon gold potatoes and onions layered with a rich, creamy cheese sauce made from sharp cheddar, gruyere, and parmesan cheeses. This classic recipe is perfect for family dinners, delivering a golden brown, cheesy topping with a smooth, garlicky, and buttery flavor profile.


Ingredients

Potatoes & Veggies

  • 6-7 medium Yukon gold potatoes, thinly sliced
  • ½ white or yellow onion, sliced

Cheese Sauce

  • 2 tablespoons salted butter
  • ¼ cup all-purpose flour
  • 1 ½ cups unsweetened almond milk (or regular milk)
  • 8 ounces sharp cheddar cheese, shredded
  • ½ teaspoon garlic powder
  • ¾ teaspoon salt
  • Freshly ground black pepper, to taste

Toppings & Garnish

  • ½ cup gruyere cheese (optional)
  • ¼ cup grated parmesan
  • Fresh parsley for garnish


Instructions

  1. Preheat & Prepare Dish: Preheat your oven to 375°F (190°C). Grease a 2-quart square baking dish thoroughly to prevent sticking and ensure easy serving.
  2. Layer Potatoes and Onions: Arrange the thinly sliced Yukon gold potatoes and the sliced onions in alternating layers in the prepared baking dish. This layering builds flavor and texture for the au gratin.
  3. Make Cheese Sauce: In a medium saucepan over medium heat, melt the salted butter. Once melted, whisk in the all-purpose flour to create a roux. Gradually pour in the almond or regular milk while continuously whisking to avoid lumps. Cook the mixture until it thickens and becomes smooth.
  4. Add Cheese and Seasoning: Stir the shredded sharp cheddar cheese into the thickened sauce until fully melted. Add the garlic powder, salt, and freshly ground black pepper to taste. Mix thoroughly to develop a rich, flavorful cheese sauce.
  5. Pour Sauce Over Layers: Evenly pour the creamy cheese sauce over the layered potatoes and onions, ensuring all parts are coated for a consistent texture and taste.
  6. Bake Covered: Cover the baking dish tightly with aluminum foil to trap steam and bake in the preheated oven for 45 minutes. This allows the potatoes to cook gently and absorb the cheese sauce.
  7. Add Toppings and Continue Baking: Carefully remove the foil, sprinkle the optional gruyere cheese and grated parmesan evenly on top. Return the dish to the oven and bake uncovered for an additional 30 to 45 minutes until the top is melted, golden brown, and bubbly.
  8. Garnish and Serve: Remove the au gratin from the oven and let it rest briefly. Garnish with fresh parsley for color and a touch of herbal freshness. Serve warm as a luscious side dish.

Notes

  • For a richer flavor, use whole milk instead of almond milk.
  • Ensure potatoes are sliced evenly to promote even cooking.
  • Covering with foil during the initial bake prevents the dish from drying out.
  • Gruyere cheese adds depth but can be omitted if unavailable.
  • Allow the dish to rest for 5-10 minutes before serving to thicken up the sauce.