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Marry Me Potato Casserole

Marry Me Potato Casserole is the kind of dish that earns marriage proposals at dinner parties, combining tender potato slices with a rich, creamy garlic sauce and a golden cheese topping. This recipe turns simple potatoes into something so irresistible that your guests might just drop to one knee. Perfect for holiday gatherings, potlucks, or any time you want to seriously impress someone, this casserole delivers comfort food at its finest.
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Prep Time 20 minutes
Cook Time 1 hour 15 minutes
Total Time 1 hour 35 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American
Calories: 342
Ingredients Equipment Method Notes

Ingredients
  

Main
  • 3 pounds Yukon Gold potatoes thinly sliced to 1/8 inch thickness
  • 2 cups heavy cream
  • 1 cup whole milk
  • 4 cloves garlic minced
  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 2 cups shredded Gruyere cheese divided
  • 1/2 cup grated Parmesan cheese
  • 2 teaspoons fresh thyme leaves
  • 1 1/2 teaspoons salt
  • 1/2 teaspoon black pepper
  • 1/4 teaspoon nutmeg
  • 2 tablespoons chopped fresh parsley for garnish

Equipment

  • 9x13 inch baking dish
  • Sharp knife or mandoline slicer
  • Large mixing bowl
  • Medium saucepan
  • Whisk
  • Measuring cups and spoons
  • Aluminum foil
  • Cutting board

Method
 

  1. Wash and peel the potatoes, then slice them into even 1/8 inch rounds using a sharp knife or mandoline. Place the sliced potatoes in a large bowl of cold water to prevent browning while you prepare the sauce.
  2. Melt the butter in a medium saucepan over medium heat, then add the minced garlic and cook for about 1 minute until fragrant but not browned.
  3. Sprinkle the flour over the butter and garlic, whisking constantly for 2 minutes to create a roux.
  4. Slowly pour in the heavy cream and milk while whisking continuously to prevent lumps from forming. Bring the mixture to a gentle simmer and cook for 3 to 4 minutes, stirring frequently, until it thickens enough to coat the back of a spoon.
  5. Remove the saucepan from heat and stir in 1 cup of the Gruyere cheese, the Parmesan, thyme, salt, pepper, and nutmeg. Stir until the cheese melts completely and the sauce becomes smooth. Taste and adjust seasoning if needed.
  6. Preheat your oven to 375°F and butter your 9x13 inch baking dish generously. Drain the potato slices thoroughly and pat them dry with a clean kitchen towel.
  7. Layer half of the potato slices in the prepared dish, overlapping them slightly. Pour half of the cream sauce over this layer, making sure it seeps between the slices.
  8. Arrange the remaining potato slices over the first layer, again overlapping them in an even pattern. Pour the remaining sauce over the top, using a spoon to spread it evenly and press down gently so the sauce fills all the gaps.
  9. Cover the baking dish tightly with aluminum foil and bake for 45 minutes. After 45 minutes, insert a knife into the center to check if the potatoes are tender. If they still have resistance, cover and bake for another 10 minutes.
  10. Remove the foil and sprinkle the remaining 1 cup of Gruyere cheese evenly over the top. Return the uncovered casserole to the oven and bake for an additional 25 to 30 minutes until the cheese turns golden brown and bubbly.
  11. Let the casserole rest for 10 minutes before serving. Garnish with fresh parsley and serve.

Notes

Slice your potatoes as uniformly as possible for even cooking. A mandoline slicer is worth the investment for recipes like this. Don't skip the resting time after baking, as this allows the sauce to set up slightly and makes serving much cleaner. This casserole can be made a day ahead and reheated gently in a 325°F oven for 30 minutes, covered with foil. The flavors actually deepen overnight.