My Gruyere Potato Casserole
4 tablespoons butter
6 medium russet potatoes (about 2½ pounds), scrubbed, peeled, cut into large chunks
3-4 garlic cloves, minced
4 tablespoons all-purpose flour
1 cup heavy cream
1½ cup milk
2 cups Gruyère cheese, grated and divided
1½ teaspoon kosher salt
½ teaspoon freshly ground black pepper
2 teaspoons paprika
1 teaspoon onion powder
Paprika and black pepper, for garnish
Preheat the oven to 350°F. Butter a 9 x 13 baking dish or spray with non-stick spray.
Bring a large pot of generously salted water to a rolling boil. Add the potatoes and simmer until just tender but not falling apart, about 13 minutes. Drain thoroughly and set aside.
In a medium saucepan, melt the butter over medium heat. Add in the garlic and sauté over medium-low until softened and fragrant, about 30 seconds.
Increase the heat to medium, whisk in the flour and cook, stirring constantly, until lightly browned and fragrant, 2 to 3 minutes. Whisking constantly, slowly pour in the heavy cream and milk until the sauce is smooth. Add in 1 cup of the Gruyère, the salt, pepper, paprika, and onion powder, then cook, whisking gently, until the cheese is melted.
Arrange the potatoes to cover the bottom of the prepared baking dish and pour the sauce over them and top with the remaining cup of Gruyère.
Place the baking dish in the oven and cook for 25 minutes.
Turn the broiler to high and broil for 5 minutes more, until fully golden brown.
Remove from oven and allow to cool for about 10 minutes so the casserole will set up.
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