Easy Potatoes Au Gratin
Tender sliced potatoes baked to perfect with a creamy sauce made with milk, cheese, garlic, mustard, and onions.
Servings: 8
Ingredients
- 2 pounds potatoes peeled and thinly sliced
- Kosher salt and freshly ground black pepper to taste
- 3 tablespoons olive oil divided
- 1 medium yellow onion thinly sliced
- 3 garlic cloves minced
- 1 tablespoon wholegrain mustard
- 3 tablespoons gluten-free flour or cornstarch
- 2 1/2 cups almond milk
- 1 teaspoon freshly grated nutmeg or to your taste
- ¾ cup grated Gruyère cheese
- Fresh thyme to garnish
Instructions
- Preheat the oven to 350F and spray a baking dish with cooking oil spray or olive oil.
- Add sliced potatoes and season with salt and pepper. Drizzle 2 tbsp oil and toss well to coat. Place in the preheated oven and bake for 15 minutes, or until potatoes begin to soften and the sauce is ready.
- Meanwhile, heat a rimmed pan over medium heat and drizzle with 1 tbsp oil. Sauté the onion and garlic for 2-3 minutes, or until it softens.
- Stir in the mustard and flour. Slowly pour the milk and whisk until sauce is thickened and smooth, 2-3 minutes.
- Season with salt, pepper, and nutmeg.
- Remove the potatoes from the oven and pour over the sauce, stirring gently to mostly cover and coat.
- Top with shredded cheese. (You can now cool and refrigerate the dish for make-ahead.)
- Return to the oven and bake for 60 minutes, or until potatoes are super tender, bubbly, and golden-brown on top. (Cooking time may vary depending on the size of the thickness of your potato slices.)
- Garnish with fresh thyme before serving.
Notes
Oven temperature: Please note that everyone's will be different and cooking time will vary. If you try a higher temperature of 400F it will take 35-40 minutes. At 350F it will need 50-60 minutes depending.
Milk: we used almond milk, but you may use any other milk of choice.
Mustard: whole grain mustard was used but you may use Dijon mustard
Cheese: If you don't like gruyere or want to use another cheese, consider using a mix of sharp cheddar and parmesan, or gouda.
Potatoes: consider using Yukon gold potatoes
Flour: Any flour would work for this recipe. Feel free to use cornstarch too. We love to use Whole wheat as well.
Bake time: Don't rush them, they need a good one hour in the oven depending on your oven
Nutrition
Calories: 127kcal | Carbohydrates: 4g | Protein: 5g | Fat: 10g | Saturated Fat: 3g | Cholesterol: 14mg | Sodium: 165mg | Potassium: 35mg | Fiber: 1g | Sugar: 1g | Vitamin A: 117IU | Vitamin C: 1mg | Calcium: 226mg | Iron: 1mg