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.
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.
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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!
Amy Liu Dong
Wow! I may say that this recipe looks really delicious and very enticing to the eye. The overload cheese stuff on this dish is so mesmerizing.
Gloria | Homemade & Yummy
Well we all know potatoes and cheese are the perfect match…hope you give this gratin recipe a try.
Sharon
The sweetness of the potatoes and the creaminess of the cheese sauce makes a wonderful combination in this dish.
Gloria | Homemade & Yummy
This really is a hearty and delicious dish. Comfort food at it’s best.
Andrea Metlika
This looks and sounds incredible. I love that you use sweet potatoes for this dish. Cannot wait to try this!!!
Gloria | Homemade & Yummy
This really is the ultimate comfort food. Hope you give it a try.
Laura
Great idea, I never made a gratin with sweet potatoes. Why I didn’t think about this before! Making it asap
Gloria | Homemade & Yummy
You really need to give this a try. A nice change from the traditional version.
Katie
I CANNOT wait to try this. Looks SO good!
Gloria | Homemade & Yummy
I know you will love it. ENJOY!
Tania | Fit Foodie Nutter
This i such a great cosy meal for all the family, especially for the fall season! Can’t wait to try this at the weekend!
Gloria | Homemade & Yummy
My family loves this version….and they don’t like regular scalloped potatoes.
Courtney
I’m not normally a big sweet potato fan other than fries but this recipe was a game changer! They are delicious prepared au gratin!
Gloria | Homemade & Yummy
This really is a great way to enjoy sweet potatoes in a delicious casserole.
Veena Azmanov
I am anything sweet potato anytime. I love au gratin and nothing beats a cheesy one. Love trying and experimenting with different cheese varieties. This sounds incredibly delicious. yum I think my kids will love this !
Homemade & Yummy
This was a pleasure to reproduce. Hope you give it a try.
Riana
Love love potato…
Homemade & Yummy
So do we. Thanks for stopping by.
Renee Gardner
Milk, butter, cream, cheese, and sweet potatoes – you have my second most favorite list of comfort foods (the first one includes both pizza and pasta!). I never make casseroles because it’s just my husband and I, but in an 8×8 pan it might be something we can tackle together. Or, I could just make it while he is traveling and eat the whole thing myself?? Decisions, decisions…
Homemade & Yummy
This is so good, it was hard not to eat the whole dish in one sitting.
Sara
Potatoes and cheese are literally my favorite combination of all time. But the fact that you are using SWEET potatoes is genius! I love that it lightens up the dish, and adds an entirely different layer of flavors. I cannot wait to try this!
Homemade & Yummy
This really is a delicious dish.
Julie
I haven’t had anything au gratin in years, but seeing this immediately took me back to childhood Thanksgivings in my grandmother’s house, where she would always make the most deliciously rich and decadent potatoes au gratin. Love the sweet potato twist on a classic dish!
Homemade & Yummy
I finally LOVE that I can make a scalloped type of potato.
Abby @ WinsteadWandering
I’m sure the sweet potatoes are great, but I can’t get past that gorgeous, perfectly-browned cheese.
Homemade & Yummy
Thanks so much, it is a really easy recipe to make.
Jessica (Swanky Recipes)
Can never have enough sweet potatoes and cheese this time of year. I love this as a side dish next to our Christmas spread. I love potato au gratin and I think I’ll serve it at our party this year to mix things up, yum!
Homemade & Yummy
Enjoy it is easy to make and totally delicious to eat.