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Marry Me Potato Casserole

Marry Me Potato Casserole is the kind of dish that makes people propose on the spot, or at least ask for the recipe before they finish their first helping. This creamy, cheesy potato casserole combines tender potato slices with a rich sauce, sun-dried tomatoes, and fresh herbs to create something truly unforgettable. Perfect for Sunday dinners, potlucks, or any time you want to seriously impress someone, this recipe delivers comfort food at its finest.
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Prep Time 20 minutes
Cook Time 1 hour 5 minutes
Total Time 1 hour 25 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: American, Mediterranean
Calories: 385
Ingredients Equipment Method Notes

Ingredients
  

For the Casserole
  • 3 pounds russet potatoes peeled and sliced 1/8 inch thick
  • 1/2 cup sun-dried tomatoes oil-packed, drained and chopped
  • 1/3 cup fresh basil chopped
  • 4 cloves garlic minced
  • 2 cups heavy cream
  • 1 cup whole milk
  • 2 cups mozzarella cheese shredded and divided
  • 3/4 cup Parmesan cheese grated and divided
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1/2 teaspoon red pepper flakes
  • 2 tablespoons butter
  • 2 tablespoons all-purpose flour

Equipment

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

Method
 

  1. Preheat oven to 375°F. Grease a 9x13 inch baking dish with butter or cooking spray.
  2. Peel the potatoes and slice them into uniform 1/8 inch rounds using a sharp knife or mandoline. Place sliced potatoes in a large bowl of cold water to prevent browning.
  3. Melt 2 tablespoons butter in a medium saucepan over medium heat. Add minced garlic and cook for about 1 minute until fragrant but not browned.
  4. Sprinkle in 2 tablespoons flour and whisk constantly for 2 minutes to create a roux.
  5. Gradually pour in the heavy cream and milk while whisking to prevent lumps from forming. Take it slow to blend smoothly.
  6. Add 1 teaspoon salt, 1/2 teaspoon black pepper, and 1/2 teaspoon red pepper flakes to the cream mixture, stirring well. Bring to a gentle simmer and cook for 3 to 4 minutes, stirring occasionally, until it thickens enough to coat the back of a spoon.
  7. Remove from heat and stir in 1 cup of mozzarella and 1/2 cup of Parmesan cheese until melted.
  8. Drain the potatoes thoroughly and pat them dry with a clean kitchen towel to remove excess water.
  9. In a large bowl, toss the dried potato slices with the chopped sun-dried tomatoes and fresh basil to distribute evenly.
  10. Layer half of the potato mixture in the bottom of the prepared baking dish, spreading it evenly.
  11. Pour half of the cream sauce over the first layer, using a spoon to help distribute it into all the gaps.
  12. Repeat with the remaining potatoes and sauce, making sure the top layer of potatoes gets well coated.
  13. Cover the baking dish tightly with aluminum foil and place in the preheated oven. Bake covered for 45 minutes until potatoes are tender.
  14. Remove the foil carefully. Sprinkle the remaining 1 cup of mozzarella and 1/4 cup of Parmesan evenly over the top.
  15. Return the uncovered casserole to the oven and bake for an additional 20 minutes until the cheese is melted, bubbly, and golden brown in spots.
  16. Let the casserole rest for 10 minutes after removing from the oven to allow the sauce to thicken and set up.
  17. Garnish with additional fresh basil if desired, and serve while still warm.

Notes

Use a mandoline slicer set to 1/8 inch for perfectly uniform potato slices that cook evenly. Don't skip drying the potatoes after soaking to prevent a watery casserole. This casserole can be assembled up to 24 hours in advance and refrigerated covered - add an extra 10 minutes to the covered baking time. Store leftovers in an airtight container in the refrigerator for up to 4 days. Can be frozen for up to 2 months, though texture may be slightly softer after thawing.