Upside Down Sweet Potato and Onion Tart

A sweet potato tart with onions, rosemary and cheddar cheese. It’s not a tart in the traditional sense being that it lacks a flour crust. Sliced onions are used instead.

The tart is baked with onions on the bottom and alternating layers of thinly sliced sweet potatoes and cheddar cheese. Once cooked it’s flipped out onto a plate so the golden, caramelized onions are on top and the creamy potatoes are underneath.

With cheese oozing out of every nook and cranny and crusty, crispy edges to covet, it’s altogether delicious. Potatoes never let me down.

Potatoes never let anyone down. Everyone loves them and their versatility knows no end.

By using a different cheese, herb or potato and you can turn this into a whole new dish.

Toss in crispy bacon crumbles or chopped ham. Serve with sour cream and chives for a baked potato version. Or how about a soft, fried egg over top?!

Hello leftovers for breakfast. If there are any.

Upside Down Sweet Potato and Onion Tart

Rating: 51

Prep Time: 15 minutes

Cook Time: 50 minutes

Total Time: 1 hour, 5 minutes

Yield: 4 servings

Upside Down Sweet Potato and Onion Tart

A crustless sweet potato tart with onions, rosemary and cheddar cheese.


2 tablespoons butter
4 sprigs rosemary or thyme
1 large onion, thickly sliced
1 pound sweet or red potatoes, washed and thinly sliced
2 tablespoons olive oil
1 + 1/2 cups cheddar cheese, grated
coarse salt and fresh black pepper


  1. Preheat oven to 400 degrees F.
  2. In a 12-inch cast iron skillet* melt better over medium heat. Add thyme and onion and cook for 5 minutes.
  3. In a large bowl gently toss the sliced potatoes, oil and cheese together seasoning well with salt and pepper.
  4. Layer the potatoes over the onions as evenly as possible. Bake 45-50 minutes. Go around the edges of the pan cutting any stuck parts away with a knife or spatula; turn the tart out onto a plate to serve. Slice into wedges.
  5. *You can bake this in casserole dish instead by buttering the dish well, adding the cooked onions over the bottom and then covering with the potatoes.


Adapted from ZipList

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  1. Jessen says

    Awesome Recipe! Love the Idea of the Onion “Crust”. I’m actually cooking up sweet potatoes (not Yams, Though) Tonight. Your Recipe inspiration/Creations are at a High Reeni! =)
    Have a Great Weekend!

    • says

      Thanks Jessen! I like sweet potatoes better than yams mostly because yams are so hard to cut when they’re raw plus sweet potatoes have a brighter color that I like. Kind of vain of me but they’re just prettier. Enjoy the rest of your weekend!

  2. says

    what an absolutely beautiful tart! I love it all the more for being crusted by onions…making a tart crust takes way too much planning ahead. Looks amazing!

  3. says

    what a particular tarte. I’ve never tried sweet potatoes but it looks very good. I like it without the crust, the cake looks like a mille feuille :) Bye, have a great Sunday

  4. says

    Well, that’s different. I’ll bet it’s really good. By the way, I made the bubble up pizza casserole yesterday! It was sooooooooooooo good. I sent the recipe to my sister and my best friend; they both want to try it!

  5. says

    Sweet potatoes, onions and cheese – all my favorites! I know I’d love this!

    Moon, hope you are having a great weekend! Purrs to you!

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