Sweet Potato Au Gratin is the ultimate comfort food casserole recipe.
Thinly sliced sweet potatoes, smothered in a cream sauce, topped with cheese. Hearty and delicious. You will also want to give these stuffed sweet potatoes a try too.
This au gratin potato recipe was originally posted in the 41st edition of the Milk Calendar and I shared it in December 2017 as a sponsored post.
I was thrilled when I was asked to recreate the January 2018 recipe Hearty Sweet Potato Au Gratin because I am a potato lover.
I was so excited when I was asked to take part in the #MilkCalendar campaign that year. My fridge is ALWAYS stocked with several varieties of cheese. I use it in delicious recipes for any meal of the day. When I want a snack, crackers and cheese are my “go-to” options most days of the week.
RECIPE and INSTRUCTIONS for this sweet potato gratin recipe can be found at the bottom of this post.
These scalloped sweet potatoes are simple and oh so delicious. Cheese is the most important factor in au gratin potatoes.
You Will Need:
- sweet potatoes
- butter
- garlic
- flour
- cream
- sharp cheddar cheese
- fresh thyme
You will want to select sharp, bold cheeses. Old cheddar, gruyere, Swiss or feta would be awesome choices.
Most people will say there is NO difference. Both use thinly sliced potatoes cooked in a casserole dish. Scalloped potatoes ALWAYS have a cream sauce. Au gratin is ALWAYS is cooked with cheese. This recipe contains both. Scalloped potatoes usually have a breadcrumb topping. Gratin Dauphinois does not.
Preparing This Sweet Potato Au Gratin Bake
These cheesy au gratin potatoes are not difficult. You have a couple of parts to this recipe. The cream sauce, and the layering of the casserole. See the recipe card for the exact instructions, but here is the quick low down.
Step ONE:
- Peel and slice your sweet potatoes (about ⅛ inch).
- Grate your cheese.
- Preheat the oven, and prepare a casserole dish.
Step TWO:
- Make the cream sauce in a medium saucepan.
- This will take about 4-5 minutes.
Step THREE:
- Layer the casserole.
- Start with the potatoes.
- Add some cream sauce, and thyme.
- Repeat the layers.
- Cover and bake.
- Remove from oven and take off the foil.
- Add the grated cheese and bake uncovered until bubbly.
This Sweet Potato Au Gratin has already become a favourite here. We like to make it different each time by switching up the cheese.
Perfect for any night of the week. Awesome on the holiday dinner table too. It is the perfect side to Crispy Baked Chicken Drumsticks.
Craving more delicious potato recipes?
Looking for another sliced potato recipe? Crispy Cast Iron Potatoes make the perfect side to any meal of the day.
How about a delicious one-pan dinner? Easy Corned Beef and Potato Skillet is perfect. In fact, we love this on St. Patrick’s Day. A little twist on corned beef and cabbage.
If you are a salad lover, this Warm Potato Salad with Dill & Smoked Salmon is out of this world. In fact, I have a great potato salad roundup with 27 mouthwatering recipes.
Need the perfect party appetizer? Smoked Salmon Potato Appetizers are elegant and easy to prepare. They fly off the party tray.
I don’t know of anyone who does not love fries. Crispy Spicy Fries are a healthy alternative since they are made in the air fryer.
In case you didn’t get one of these FANTASTIC calendars, don’t fret, I’ve got you covered. Visit MilkCalendar.ca to find out how to order a copy. Be sure to have a look at all the great online recipes and helpful videos too. I know lots of people who have been collecting these calendars for years.
Milk Calendar Hearty Sweet Potato Au Gratin
Ingredients
- 1 ½ pounds sweet potatoes
- 2 tablespoons butter
- 1 clove garlic (minced)
- ½ teaspoons salt
- 2 tablespoons all-purpose flour
- 2 cups 18% cream
- 2 tablespoons fresh thyme (chopped)
- ½ cup Canadian cheddar (shredded)
Instructions
- Preheat oven to 375º F, and grease a 8×8 inch baking pan. Set aside.
- Peel potatoes and carefully slice into ⅛ inch thick rounds. Set aside.
- Grate/shred cheese. Set aside.
To make the Cream Sauce:
- In a medium saucepan melt butter over medium heat.
- Add garlic and salt. Stir 1 minute.
- Whisk in flour until combined.
- Gradually add cream, whisking until combined and smooth.
- Bring to a boil, and heat until thickened (2-3 minutes), whisking occasionally. Remove from heat when done.
To layer the Sweet Potato Au Gratin:
- Layer ½ the potatoes into the prepared baking dish.
- Scatter ½ the chopped thyme on top.
- Top with ½ the cream sauce.
- Repeat with the potatoes, sauce and thyme.
- Press down slightly to even out layers and get all potatoes covered in cream.
- Cover with foil, and bake for 30 minutes.
- Take dish out of the oven, and remove foil.
- Sprinkle grated cheese (and additional thyme if you like), and bake uncovered for 15 minutes until top is bubbly and deep golden brown.
- Remove from oven and let stand for 10 minutes.
- ENJOY!
April
I didn’t like scalloped potatoes when I was a kid. I love them now. This looks delicious!
Homemade & Yummy
Well I think these are in a league all their own.
Martha Albers
This is perfect! Lots of cheese and sweet potatoes; my husband would love this one!
Homemade & Yummy
Hope you give them a try.
Elizabeth | The Recipe Revival
Oh my gosh I am drooling over here! This looks and sounds amazing, You can’t go wrong with potatoes and cheese!
Homemade & Yummy
NEVER…always a delicious match for sure.
swathi
Looks delicious, Congrats for being part of the one calendar you always use it in kitchen. This sweet potato gratin looks so creamy and rich with milk and cheese so yum.
Homemade & Yummy
I was only a “tester”….but so many great recipes to try for sure.
Karyl | Karyl's Kulinary Krusade
I can’t even remember the last time I had au gratin potatoes, and I don’t know why because it’s such a delciious, comforting dish! I love that you use sweet potatoes instead of regular in this one. Looks really good
Homemade & Yummy
This is a winner…that we will keep making for sure.
Kathy McDaniel
A calendar with recipes sounds amazing! I would love to get one. I absolutely love sweet potatoes and this recipe is pure perfection! We always have tons of cheese at home so this is a must for us! Gratins are always so elegant but still comforting and pleasing! Yum!
Homemade & Yummy
Yes this sure us comforting…and totally delicious.
Jenn
Always looking for a great au gratin recipe and this looks delicious. Your in progress shots are beautiful too!
Homemade & Yummy
Thanks so much for the compliment, much appreciated.
Catherine Brown
I’ve never made au gratin with sweet potatoes before… this is a bit foreign but would certainly increase the nutrient profile from standard Russett potatoes. I’m game! I will add a bit of spice though, perhaps a dash or cheyenne or chipotle. 🙂
Homemade & Yummy
I think you could spice this up as much as you like.
Tiffany
I just love sweet potatoes! I was going to make scalloped potatoes for Christmas dinner. However, after seeing this I just changed my mind. This looks delicious!
Homemade & Yummy
Enjoy….they certainly are delicious.
Michelle
Oh my gosh, I love potato au gratin. I love this sweet potato version! I’d eat that whole casserole dish! I’m definitely trying this.
Homemade & Yummy
Yes is is sort of addictive I do agree.
Stefanie - Sarcastic Cooking
Not only would I totally be obsessing over that calendar too, I would be eating that creamy sauce solo! Hahah! Oh man and that shot of the cheddar, wow! I like how you added some color and a different flavor profile with the sweet potatoes!
Homemade & Yummy
This is the perfect comfort food.
Veena Azmanov
I love Au Gratin and we usually make it with potatoes. I bet the sweet potato taste yum. The milk calendar sounds amazing. :Love the of nutritious healthy recipes. Saving this for later.
Homemade & Yummy
Hope you give this a try. Sweet potatoes work really well.
Colleen
Yum! We love scalloped potatoes here, but I’ve never tried them with sweet potatoes. I need to make these! Thanks for sharing.
Homemade & Yummy
I am so happy my family loves this dish….but now I have to share.
Sam | Ahead of Thyme
Yumm!! My mouth is drooling! Am pinning this for later!
Homemade & Yummy
Hope you give it a try…it is so good.
Julia
Seriously? Your family doesn’t like scalloped potatoes? This is so strange! Although, come to think of it, my husband is also not the biggest fan. I love that this dish is made with Sweet Potatoes. I am definitely going to try it. Such a wonderful and delicious recipes. And the pictures are beautiful, Gloria!
Homemade & Yummy
Thanks so much Julia….and the dish is really good.