These easy Oven or Instant Pot Sweet Potato Gratin, made with pantry staples, is the perfect make-ahead decadent side or even main dish. The potatoes are cooked to tender perfection in a creamy sauce with some anchovies – a delicious twist to the classic sweet potato casserole.
Suitable for gluten free diets.
This simple yet deliciously warming Sweet Potato Gratin recipe combines layers and layers of sliced sweet potatoes interspaced with a bit of salty anchovies and a bit of heat, baked in a creamy sauce till it is all ooey goey caramelised.
It is an easy, recipe that can be baked in the oven or alternatively in the Instant Pot when you don’t want to heat up your kitchen. Just as easy to make like this Instant Pot Scalloped Potatoes, Creamy Scalloped Corn or Corn Pudding Casserole.
This quick Instant Pot Sweet Potato Gratin is a warming and comforting recipe that makes a great side dish for various meals like the brunch, dinner, Easter, Thanksgiving, potlucks, Christmas and more. Or serve with a salad for a complete meal.
Why Make This Recipe
- It’s an easy creamy, decadent side dish everyone will love.
- Leftovers taste soooo much better the next day.
- It is made from affordable everyday fridge and store cupboard ingredients.
- Scale up – the oven version is easily double or tripled to feed a crowd.
- Dietary – gluten free.
Ingredient Notes
- Sweet Potatoes – This recipe uses orange sweet potatoes that are peeled and sliced thin.
- Anchovies – Use tinned anchovies in oil that have been drained. Chop them up small. Feel free to add even more anchovies if you wish. Because of the anchovies you dont need to add any extra salt.
- Crunchy chili sauce – I used the mild crunchy chili sauce you get in Chinese restaurants (specifically Lao Gan Ma crispy chilli in oil). If you use a hotter chili you may need to reduce it to your taste.
- Green onions – also called spring onions or scallions use both the green and white bits.
- Whole milk – but you can use half fat milk too
- Heavy cream – Heavy cream keeps it decadent but you can use half and half.
How To Make Sweet Potato Gratin
- Preheat the oven to 400F / 200C / gas 6.
- Into a lightly oiled baking dish, add a layer sweet potato and top with some anchovies, chili sauce and green onions.
- Then repeat with more layers until all the ingredients are gone.
- Pour the milk and cream over the mixture, cover with some foil and bake at for 40 minutes.
- Then remove the foil and bake uncovered for about 20 mins until done and tops nicely caramelised.
Make Instant Pot Sweet Potato Gratin
- Into an Instant Pot ready lightly oiled baking dish, add a layer sweet potato and top with some anchovies, chili sauce and green onions.
- Then repeat with more layers until all the ingredients are gone.
- Pour the milk and cream over the mixture, cover with some foil and place on an instant pot trivet.
- Add the 1.5 cups of water to the Pressure Cooker insert, place the dish on the trivet in the Instant Pot, close pot, set valve to sealing, manual, high pressure, and timer to 35 minutes
- Let cook till done and then do a quick release of the pressure.
- Remove the potatoes in the dish from the Pressure Cooker, discard the foil and place the potatoes under the grill/broiler for 5 minutes until the top is golden and crispy.
Recipe Tips
- Let it sit for about 15 minutes for the juices to thicken even further before serving.
- Slice potatoes to the same size. Cut your potato to a similar thickness so that they cook at similar rates. Using a mandolin to cut the potatoes will help.
- Cook the sweet potato bake casserole on a baking sheet or tray for easy cleanup if it overflows whilst baking.
- For the Instant Pot version make sure the potatoes are submerged in the liquid. You may need to add a little more cream and milk to make sure.
Delicious Variations
- Add in meat – add in some cooked smoky bacon, cubbed ham or shredded chicken.
- Add heat – add extra heat with red pepper flakes, jalapeños, cayenne and more.
- Add cheese – add in some grated parmesan or Gruyère for extra flavor.
- Add crunch – Just before serving tops with a maple roasted nuts crunch.
Storage
- Prep ahead – Slice your sweet potatoes ahead of time and refrigerate in an airtight container up to 24 hours before hand. Also you can assemble the unbaked gratin about 6 hours ahead.
- Store – Store the cooled casserole in the fridge for up to 3 days.
- Reheat – Reheat foil covered casserole at 350F /180C for about 25-30 mins, and remove the foil for the last 5 minutes to help it crisp up.
FAQs
You certainly can. Just scrub them clean before slicing.
Certainly. Substitute up to a quater of the sweet potatoes with regular potatoes that have been sliced just as thin.
In the U.S., you’ll often find grocers interchanging the two names. But, you’ll find that Sweet Potatoes and Yams, while similar in appearance, taste different. In fact, most likely the “yams” you’re getting at the market are just Sweet Potatoes.
The copper color skinned ones are often referred to as a Yam or a Sweet Potato Yam. However, they’re usually just a firmer Sweet Potato. The softer Sweet Potatoes are usually yellow inside and have lighter skin.
True Yams are native to Africa and Asia. They grow as a root vegetable to a flowering plant and cook differently than Sweet Potatoes. Yams have brown, bark-like skin and aren’t commonly found in US markets. You would need to check out a special grocer and they may not taste as sweet in this Southern Candied Sweet Potatoes dish as regular Sweet Potatoes would.
Serving Suggestions
- Best Juicy Grilled Whole Chicken.
- Juicy Grilled Steak.
- Grilled Lamb Leg Steaks.
- Spinach Salad.
- Baked Picnic Ham.
- Air Fryer Cornish Hen.
- Instant Pot Chicken Breast.
- Smoked Pork Shoulder.
More Recipes You Might Like
- Instant Pot Scalloped Potatoes.
- Instant Pot Mashed Sweet Potatoes.
- Creamy Scalloped Corn .
- Corn Pudding Casserole.
Get The Sweet Potato Gratin Recipe
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Anchovy, Chilli and Sweet Potato Gratin
Ingredients
- 2 lb sweet potato, peeled and sliced thin
- 8 anchovy fillets, chopped up
- 3 large scallions white and green parts sliced
- 2 tablespoon crunchy chili in oil
- 1 1/2 cups heavy cream
- 1/4 cup milk
Instructions
Make In The Oven
- Preheat the oven to 400F / 200C / gas 6.
- to an oven dish add a layer sweet potato and top with some anchovies, chili and green onions.
- Then repeat with more layers until all the ingredients are gone.
- Pour the milk and cream over the mixture, m ake sure to press the top sweet potato rounds into the sauce. cover with some foil and bake at for 40 mins.
- Then remove the foil and bake uncovered for about 20 mins until done and tops nicely caramelised.
- Let it sit for about 15 minutes for the juices to thicken even further before serving.
Make In The Instant Pot
- Into an Instant Pot ready baking dish, add a layer sweet potato and top with some anchovies, chili sauce and green onions.
- Then repeat with more layers until all the ingredients are gone.
- Pour the milk and cream over the mixture, cover with some foil and place on an instant pot trivet.
- Add the 1.5 cups of water to the Pressure Cooker insert, place the dish on the trivet in the Instant Pot, close pot, set valve to sealing, pressure cook or manual, high pressure, and timer to 36 minutes.
- Let cook till done and then do a quick release of the pressure.
- Remove the potatoes in the dish from the Pressure Cooker, discard the foil and place the potatoes under the grill/broiler for 5 mins until the top is golden and crispy.
Recommended Products
Notes
- et it sit for about 15 minutes for the juices to thicken even further before serving.
- Slice potatoes to the same size. Cut your potato to a similar thickness so that they cook at similar rates. Using a mandolin to cut the potatoes will help.
- Cook the sweet potato bake casserole on a baking sheet or tray for easy cleanup if it overflows whilst baking.
- For the Instant Pot version make sure the potatoes are submerged in the liquid. You may need to add a little more cream and milk to make sure.
Nutrition
If you like this recipe the why not check out the other recipes below.
Sweet potato and ham dauphinoise by Kavey Eats.
Sweet potato and fresh ginger protein balls by Veggie Desserts.
Sweet potato, coconut and chickpea curry by Planet Veggie.
Sticky baked sweet potatoes by Family Friends Food.
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