Sweet Potatoes Au Gratin

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Indulge in cheesy, creamy goodness with these au gratin sweet potatoes! They’re a delightful twist on the classic potato au gratin, perfect for any holiday feast!

Get ready to savor sweet potatoes like never before with our sweet potatoes au gratin! Tender layers of sweet potatoes are baked in a creamy, cheesy sauce, and crowned with crispy Ritz cracker crumbs, adding a delightful crunch to every bite.

The sweet potatoes turn out wonderfully tender and cheesy, while the golden Ritz cracker crust adds that extra satisfying crunch. This dish is a comforting delight for intimate family dinners and festive gatherings alike.

To whip up this mouthwatering au gratin potatoes recipe, simply slice the potatoes and whip up your creamy sauce. Layer your casserole dish with the creamy sauce and sweet potato slices, sprinkle on the Ritz cracker crumbs, and bake! Say hello to your new favorite way to enjoy sweet potatoes.

Sweet Potatoes Au Gratin

Prep Time 30 minutes
Cook Time 1 hour
Total Time 1 hour 30 minutes
Course Dinner
Servings 10


  • 3 large sweet potatoes any color

Au Gratin Sauce:

  • 6 tablespoons unsalted butter
  • ½ medium yellow onion minced
  • ½ teaspoon sea salt divided
  • 6 cloves garlic minced
  • cup all-purpose flour
  • ½ teaspoon cracked black pepper
  • 1 tablespoon chopped fresh thyme
  • 1.5 cups 2% milk
  • 1 cup chicken broth
  • 1 cup grated parmesan cheese
  • 1 cup shredded gruyere cheese


  • 15 Ritz crackers crumbled
  • 2 tablespoons fresh thyme


  • Preheat the oven to 400°F and grease a 9×13-inch casserole dish.
  • Use a mandolin to slice the sweet potatoes into uniform rounds. Aim for a thickness of 1.3mm or 2mm. Set aside.
  • In a large skillet over medium-high heat, melt butter. Add minced onion and ¼ teaspoon salt. Sauté for 3-4 minutes, then add minced garlic and sauté until fragrant, about 1 minute.
  • Add flour, pepper, and fresh thyme to the skillet, stirring until it forms a paste. Cook for at least 1 minute.
  • Reduce heat to medium and slowly whisk in milk, ensuring it doesn’t burn. Once added, the mixture should thicken quickly.
  • Slowly add chicken broth, whisking constantly to combine and thicken.
  • Remove from heat and gradually add parmesan and gruyere cheese, whisking until melted and smooth.
  • Spread 1 cup of cheese sauce evenly on the bottom of the casserole dish. Arrange sweet potato rounds, skin side up, filling the dish.
  • Pour remaining sauce over the potatoes, pushing it down between the slices.
  • Sprinkle Ritz cracker crumbs over the top, covering the dish.
  • Bake covered for 30 minutes, then uncovered for 30 minutes.
  • Let rest for 10 minutes before serving, garnishing with fresh thyme.


  • Gluten-free bread crumbs can substitute for Ritz crackers.
  • Uncover the dish for the second half of baking to allow the sauce to thicken.

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