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SideChef
Recipes
Budget-Friendly
Sweet Potato Gratin
Recipe

14 INGREDIENTS • 10 STEPS • 1HR 20MINS

Sweet Potato Gratin

Move over sweet potatoes with sweet toasty marshmallow tops, or roasted sweet potatoes - there is a new kid in town! Layered with fresh herbs, garlic, heavy cream and authentic Gruyere cheese and shredded Parmesan Reggiano cheese, the tender and savory flavor will absolutely melt in your mouth!
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Snowflakes & Coffeecakes
I'm Diane, but you can call me Mama V! I love to create and make family-friendly food for my family and friends, and I love sharing my favorite tried-and-true recipes.
https://www.snowflakesandcoffeecakes.com/
Move over sweet potatoes with sweet toasty marshmallow tops, or roasted sweet potatoes - there is a new kid in town! Layered with fresh herbs, garlic, heavy cream and authentic Gruyere cheese and shredded Parmesan Reggiano cheese, the tender and savory flavor will absolutely melt in your mouth!
1HR 20MINS
Total Time
$3.47
Cost Per Serving
Ingredients
Servings
8
US / Metric
Sweet Potato
2 lb
Sweet Potatoes
Russet Potato
1.5 lb
Russet Potatoes
Heavy Cream
3 cups
Heavy Cream
Salt
1/2 Tbsp
Salt
Freshly Ground Black Pepper
1 tsp
Freshly Ground Black Pepper
Garlic
3 cloves
Garlic, minced
Fresh Thyme
1 Tbsp
Chopped Fresh Thyme
crushed before chopping
Fresh Sage
1 Tbsp
Chopped Fresh Sage
crushed before chopping
Fresh Rosemary
1 tsp
Chopped Fresh Rosemary
crushed before chopping
Whole Nutmeg
1 1/4 tsp
Freshly Grated Whole Nutmeg
Cayenne Pepper
1/4 tsp
Cayenne Pepper
Gruyère Cheese
2 1/2 cups
Grated Gruyère Cheese
or Swiss Cheese
Parmigiano-Reggiano
2 cups
Grated Parmigiano-Reggiano
Fresh Thyme
to taste
Fresh Thyme
for garnish
Nutrition Per Serving
VIEW ALL
Calories
724
Fat
49.9 g
Protein
23.8 g
Carbs
44.6 g
Add to plan
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Sweet Potato Gratin
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author_avatar
Snowflakes & Coffeecakes
I'm Diane, but you can call me Mama V! I love to create and make family-friendly food for my family and friends, and I love sharing my favorite tried-and-true recipes.
https://www.snowflakesandcoffeecakes.com/

Author's Notes

For best results, weigh the potatoes on a kitchen/digital scale before starting to make sure you have the correct amounts – it really does make a difference!
Cooking InstructionsHide images
step 1
In a medium bowl, whisk together the Heavy Cream (3 cups), Salt (1/2 Tbsp), Freshly Ground Black Pepper (1 tsp), Garlic (3 cloves), Fresh Thyme (1 Tbsp), Fresh Rosemary (1 tsp), Fresh Sage (1 Tbsp), Whole Nutmeg (1 1/4 tsp) and Cayenne Pepper (1/4 tsp). Set aside.
step 2
Mix together the Gruyère Cheese (2 1/2 cups) and Parmigiano-Reggiano (2 cups). Set aside.
step 2 Mix together the Gruyère Cheese (2 1/2 cups) and Parmigiano-Reggiano (2 cups). Set aside.
step 3
Peel Sweet Potatoes (2 lb) and Russet Potatoes (1.5 lb).  Using a handheld mandolin slicer or a sharp knife, slice potatoes into thin rounds (somewhere between 1/16 and ¼-inch thick slices). Be careful with the mandolin slicer – most common form of severe cuts in the kitchen!
step 4
Preheat oven to 425 degrees F (220 degrees C). Spray a 9x13-inch casserole dish with non-stick cooking spray.
step 5
Pour ½ cup of the cream mixture on the bottom (this helps keep the potatoes from sticking to the bottom and burning). Layer one layer of sweet potato slices in a circular pattern, overlapping them slightly.
step 5 Pour ½ cup of the cream mixture on the bottom (this helps keep the potatoes from sticking to the bottom and burning). Layer one layer of sweet potato slices in a circular pattern, overlapping them slightly.
step 6
Drizzle ¾ cup of the cream mixture on top, then sprinkle 1 cup of cheese on top. Next layer with white potato slices, drizzle ¾ cup of cream mixture, and sprinkle with 1 cup of cheese on top.
step 7
Finish with final layer of sweet potato slices, drizzle with remaining cream mixture, and sprinkle with remaining shredded cheese. Garnish with Fresh Thyme (to taste).
step 7 Finish with final layer of sweet potato slices, drizzle with remaining cream mixture, and sprinkle with remaining shredded cheese. Garnish with Fresh Thyme (to taste).
step 8
Cover with foil and bake for 15 minutes.
step 9
Remove the foil, reduce heat to 400 degrees, and bake until the top is golden and bubbly, 45 to 50 minutes.
step 10
Remove from oven and let cool slightly before serving. The sauces and cheese will thicken slightly as it sits.
step 10 Remove from oven and let cool slightly before serving. The sauces and cheese will thicken slightly as it sits.
Tags
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Budget-Friendly
Gluten-Free
Comfort Food
Christmas
Shellfish-Free
Fall
Vegetarian
Potatoes
Side Dish
Thanksgiving
Winter
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