Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water, stirring occasionally, until halfway cooked, about 4 minutes. Drain.
Combine heavy cream, milk, and 1/2 of Gruyere cheese in a large bowl. Add elbow macaroni and mix well; season with salt and pepper. Cover bowl with plastic wrap and refrigerate for 24 hours.
Bring the macaroni mixture to room temperature, 30 minutes to 1 hour. Pour into a 2-quart baking dish. Sprinkle remaining Gruyere cheese on top.
Preheat oven to 400 degrees F (200 degrees C).
Bake in the preheated oven until golden and crispy, 15 to 20 minutes.
Nutritional Facts
Per 6 servings
Calories: 507
Carbohydrate: 32g
Fat: 37g
Fiber: 1g
Protein: 14g
Sugar: 4g
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