The Best Potatoes au Gratin Ever
Fact: Mashed doesn't have to be your default when it comes to potato side dishes. Prepare thy tastebuds for this creamy potatoes au gratin recipe.
Ingredients
- 5 tablespoons unsalted butter, divided
- 1 sweet onion, thinly sliced
- 3 garlic cloves, minced
- 1 tablespoon grainy mustard
- 2 cups half-and-half
- 2 pounds potatoes, peeled and thinly sliced
- Salt and freshly ground black pepper
- ½ teaspoon freshly grated nutmeg
- ¾ cup grated Gruyère cheese
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