This post may contain affiliate links which means I may receive a commission for purchases made through links. I will only recommend products that I have personally used! Learn more on my Private Policy page.
Do you want to create a pretty elegant looking potato dish that is pretty darn easy to make? Then this Baked Potatoes and Onions is your dish. All you need to pull this dish together is a mandolin. You want to get a pretty thin slice on your potatoes and it would take a really long time if you were cutting these by hand. Also, the slicing occurs before they potatoes are cooked at all so you need a strong tool to do the cutting.

Baked Potatoes and Onions
I adapted the basic recipe from The Smitten Kitchen. She only uses sweet potatoes. I used a Idaho potato and added onions for additional sweetness and flavor. The onion addition is a great idea. I hand sliced the onions but a mandolin would have been a good idea. Ask me why I cut these by hand and did not use my mandolin? I have no good answer. Why do we make extra work for ourselves when cooking? You know what I am saying. We all do it. I do it all the time. I never take the easy way out. My mandolin was out so what was I thinking.
So I digress. These Baked Potatoes and Onions are so simple to make. Once the potatoes and onions are cut, they are added to a baking dish that has butter and oil at the base. The potatoes are placed in the baking dish vertically – stand them up on their side. Put onions in between every few potatoes. The potatoes are arranged in a ring around the dish. Pack them pretty closely. When you can not fit any more potatoes in, top with the remaining onions.


- 3 Pounds Idaho potatoes
- 1 large yellow onions
- 3 tablespoons butter, melted and divided
- 3 tablespoons olive oil,divided
- 2 teaspoons salt
- 2 teaspoons pepper
- Begin by peeling and washing the potatoes.
- Using your mandolin, slice all the potatoes to roughly 1/4" of thickness
- Slice the onions to a similar thickness.
- In a baking dish, place 2 tablespoons each of the butter and oil.
- Start ringing the potatoes and onions around the outside of the bowl.
- After every three potatoes, add a sliced onions layer.
- Work all the way around until a circle is created around the outside of the dish.
- Move to the center and try to create a ring again following the same potatoes and onion distribution.
- Taking a brush, brush the remaining butter and oil on the top of the potatoes and onions.
- Sprinkle the salt and pepper evenly on the top of the potatoes.
- Bake in an oven at 450 degrees for approximately 50 minutes.
- Serve and enjoy!

Idaho Potatoes
The mandolin sliced potatoes and sliced onions.

Mandolin Sliced Potatoes

Sliced Onions
The potatoes in the baking dish Pre-Baked.

Potatoes and Onions Pre-Bake
The final baked potato dish.

Plated
These potatoes look exquisite, and I love the approachable instructions!
Dear Peter, what a beautiful presentation. Your baked potatoes sound wonderful…a perfect side for the holidays especially. Take care my friend, Catherine
Thank you so much Catherine.
yum. this almost looks too pretty to eat. I love potatoes and onions together
That is so nice of you to say.
What a beautiful and delicious looking dish! Perfect side dish for a holiday table 🙂
Thx Paige. A holiday table is the perfect place for this dish.
Mmm, potatoes and onions are two of my favorite things ever, so i love them paired together!
Mine too and they do go well together.
This side dish looks easy and delicious! Thank you for the recipe!
Thx Elena.
Peter, these look great. Growing up we ate a verions of this, but nothing this spectacular looking.
So fun that you had this as a kid.
This lovely (and easy) recipe is on my holiday “to do” list. I think your idea of adding onions will add a depth of flavor to those yellow potatoes. Just yummy!
I am so glad you and others have said this would go on your holiday table.
Potato and onions… everything I love! Thanks for this delicious and easy family dish, Peter!
You are very welcome Del.
So simple, but big impact!! Love it!
Well said Diana.
Peter this looks so tasty! Definitely a new way to make potatoes that i will try – I have a mandolin, so I can see throwing this together pretty easily, then cooking the rest of dinner while this gets done in the oven. Love this!
You have it exactly right Erica. This is a potato dish you do not have to stand over.
I love potatoes and onions! The presentation is very inviting. I just want to crunch that crispy top and dive under for a forkul of tender potato onion flavor. Yum!
I want to dive into your description.
This is my idea of comfort food. I love all the flavors in this baked potato. Those onions are just right.
Thx Rini.
What a great dish for Sunday supper and Thanksgiving! Beautiful photo as always Peter!
Thanksgiving would be a good idea.
I am just drooling! perfectly baked potatoes!
Thx Katerina.
Potatoes and onions, 2 of my favorite things so this could be a meal for me. Great dish.
Thx Janette.
This is a great idea, pinning this one to make for a week night meal!
Cool. Let me know if you do?
Pretty elegant AND pretty darn easy?!?! Game on! What a lovely yet perfectly simple side dish! I love the addition of onion to boost flavor, too!
Thx for the kind words Shelley.
This is my kind of recipe – simple and yet flavorful! I can eat this delicious side dish everyday!
You described it just right Abigail.
This is such a beautiful and tempting dish, Peter! The perfect comfort food too!
It is a good combo!
Wonderful!
Comfort food at its finest! Yum!
I’ve never baked my potatoes this way. Looks so simple and awesome at the same time. Pinning to reference later!
Thx so much Rachel.
This looks so comforting! Perfect fall dish!
Tasty too.
I can almost smell this wonderful dish, through your delicious photos! Great job with this one!
Thx Dan!
Peter – this looks beautiful and delicious! Is it bad that I immediately want to add cheese to it, too?? 🙂
Tara, that would be a great idea. How about putting some slow melting cheese between the potatoes while baking?