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Sweet potatoes au gratin

Sweet potatoes au gratin

By Mia Do
30’ Prep time
60’ Cook time
90’ Total time
279 Calories
10 Serving

Summary

Enjoy sweet potatoes like never before with these sweet potatoes au gratin! layers of sweet potatoes are baked in a cheesy, creamy sauce and topped with ritz cracker crumbs rather than traditional bread crumbs to create a crispy exterior and layers of flavor.
Mia Do 0 Followers

Step by Step

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Step 1

Preheat the oven to 400ºF and grease a 9×13-inch casserole dish.
Step 2
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Step 2

Prepare the sweet potatoes by using a mandolin to slice them into uniform rounds. A 1.3mm or 2mm thickness works for this recipe. Try to avoid thicker potato slices. Set the potatoes aside.
Step 3
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Step 3

Prepare the au gratin sauce. Melt butter in a large skillet over medium/high heat. When the butter is melted, add the onion and ¼ teaspoon of salt. Saute for 3-4 minutes. Add the garlic and saute until fragrant, about 1 minute.
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Step 4

Add the flour, pepper, and fresh thyme to the skillet and mix with the ingredients until it turns into a paste. Cook the mixture for at least 1 minute.
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Step 5

Turn the heat to medium heat and slowly add the milk to the skillet, whisking constantly so the milk doesn’t burn. Once all the milk has been added, it should thicken quickly.
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Step 6

Slowly add the broth to the skillet, whisking to combine and thicken.
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Step 7

Remove the mixture from the heat and add the parmesan and gruyere cheese a little bit at a time, whisking vigorously until melted. The mixture should be smooth (except for the onion and garlic) and thick.
Step 8
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Step 8

Add 1 cup of cheese sauce to the bottom of the 9×13-inch dish. Spread it out evenly. Place the sweet potato rounds, skin side up, into the dish. The sweet potatoes should fill the entire dish.
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Step 9

Pour the remaining sauce evenly over the potatoes. Use a spatula to push the sauce down and in between the potatoes.
Step 10
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Step 10

Lastly, spread the Ritz cracker crumbs over the top of the potatoes and cover the casserole dish.
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Step 11

Bake for 30 minutes covered and 30 minutes uncovered.
Step 12
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Step 12

Remove from the oven and let the potatoes rest for 10 minutes before serving. Top with the remaining fresh thyme.

Tips and Warnings

  • Gluten-free bread crumbs can be used in place of the Ritz crackers.
  • The dish must be uncovered for the second half of the bake time so the sauce can cook off and thicken.

Ingredient

  • Ritz crackers
    Ritz crackers
    15
  • Large sweet potatoes
    Large sweet potatoes
    3
  • All-purpose flour
    All-purpose flour
    78.78 ml
  • Grated parmesan cheese
    Grated parmesan cheese
    236.59 ml
  • Chicken broth
    Chicken broth
    236.59 ml
  • Unsalted butter
    Unsalted butter
    88.72 ml
  • Fresh thyme
    Fresh thyme
    29.57 ml
  • Medium yellow onion
    Medium yellow onion
    0.5
  • 2% milk
    2% milk
    3548.82 ml
  • Chopped fresh thyme
    Chopped fresh thyme
    14.79 ml
  • Cracked black pepper
    Cracked black pepper
    2.46 ml
  • Sea salt
    Sea salt
    2.46 ml
  • Garlic
    Garlic
    6 pcs
  • Shredded gruyere cheese
    Shredded gruyere cheese
    236.59 ml

Nutrition Facts

View nutrition facts
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