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!
Lois. O
This recipe is right up my alley! I can just imagine that the sweet and savory flavor combinations will be delicious
Homemade & Yummy
Yes this is a winner for sure.
Monica | Nourish & Fete
I’m right there with you – our fridge is ALWAYS stocked with multiple kinds of cheese! Sweet potatoes are another family favorite, so this looks right up our alley!
Homemade & Yummy
Hope you give it a try.
michele
What a great idea you have here…. seriously, I just added everything to a list to make sure I buy everything at the market to make it!
Homemade & Yummy
ENJOY….this is so good.
Elena
I made a similar dish for Thanksgiving this year but I used yellow potatoes. I can imagine how tasty it is with sweet potatoes! Love the addition of thyme here!
Homemade & Yummy
It works with both kinds of potatoes…and yes the thyme is great in this dish.
Carolyn
This is the perfect side for holiday dinners!
Homemade & Yummy
Yes it is a great side dish for sure.
Jocelyn (Grandbaby Cakes)
These au gratin sweet potatoes are a must try dish!!!
Homemade & Yummy
So delicious it is hard to stop eating them.
Sara
This looks like a dish of pure comfort. That cheese <3<3!
Homemade & Yummy
Yup….it sure is.
Camilla Hawkins
Oh wow, I have never had a sweet potato gratin but seeing this delicious dish has made me want to make this:-)
Homemade & Yummy
Oh my, this was so good. Hope you give it a try.
Amanda
I keep hearing about this calendar, and it sounds fantastic! I wish we had something like that here in NJ. This gratin is gorgeous. It’s one of those warming, comforting dishes that is also elegant for company and perfect for a holiday. I wish I could reach in with my fork!
Homemade & Yummy
We did like this dish VERY much. Check the link, and download the calendar.
Jessica Robinson
These look so creamy and delicious! I am dying to try my hand at this yummy dish! Thanks for sharing!
Homemade & Yummy
You are welcome, hope you give them a try.
Veena Azmanov
I love au gratin and it reminds me of my mom. She use to make the best au gratin as a kid. Often sneak in some green leaves which I remember fishing out.. This looks wonderful, I can almost smell the cheese.
Homemade & Yummy
We really enjoyed this dish…and will be making it again…trying out a different cheese next time.
Rezel Kealoha
I make a similar version during the winter. There is just something comforting about melted cheese!
Homemade & Yummy
CHEESE is good….REALLY good!
Sarah
I love calendars! It’s actually been a few years since I’ve bought one, but I miss having one, and this one sounds FABULOUS! And these potatoes.. omg. I want to lick my computer screen!
Homemade & Yummy
HAHAH….well hope you give them a try.
Carmen
Okay, first, sweet pitatl gratin?! Yummy!!!! I HAVE to try this! Second, a calendar filled with yummy cheesy, milky goodness?! What could be better?! Love it!
Homemade & Yummy
YES so many great recipes to try.
Stephanie
Oh my – this looks fantastic! I want to try it soon!!
Homemade & Yummy
ENJOY…. is is a delicious for sure.