Caramelized Onion and Potato Gratin – 5 Ingredients

I love big dish meals so that everyone can help themselves, instead of waiting to be served by their host. It’s just what is needed so diners can eat as much or as little as they want. This family-friendly onion and potato gratin is a great vegetarian Thanksgiving recipe that can be served as main course or a side dish as preferred.

It always amazes me how some very fancy-sounding recipes and foods are actually very easy to make. A frittata is basically a baked omelet, a roulade is essentially something that’s rolled up, and au jus just means “with juice” in French.

Another dish that always sounds fancy, to me anyway, but is actually very simple is gratin. For years, I thought this was some kind of goats’ cheese tart or something equally high-brow. It turns out that, really, it’s nothing more than baked layers of potato, and is really easy to make.

I made this recipe last year for Thanksgiving, and it was an instant hit. Like me, my friends were very impressed we were having gratin because they too thought it was fancier than it really was!

Whether your friends and family know what gratin is or they don’t, I know they’ll love this tasty and very simple dish. And you don’t even have to tell them how easy it is to make.

Preparation time – 30 minutes

Cooking time – 1 ½ hours

Number of servings – 4


  • 1 tablespoon butter
  • 6 large potatoes, peeled and thinly sliced
  • 3 Vidalia onions, peeled and sliced thinly
  • 3 tablespoons finely chopped fresh sage leaves
  • 2 cups oat cream
  • 2 tablespoons olive oil
  • Salt and pepper to taste


  1. Preheat your oven to 375 degrees F.
  2. In a large pan, heat the oil and butter, and cook the onions with some salt and pepper until caramelized
  3. Remove from the heat and stir in the sage. Leave to cool
  4. Meanwhile, make a layer with some of the potatoes in a 10×10 inch casserole dish
  5. Add a layer of onions, and pour over 2 tablespoons of cream
  6. Continue adding more layers until all the ingredients are used
  7. Compress the layers slightly, and then put the lid on your casserole dish
  8. Covered, bake for 25 minutes, and then remove the lid and bake for a further 20-25 minutes until browned
  9. Allow resting for 10 minutes before serving


Caramelized Onion and Potato Gratin - 5 Ingredients recipe

Recipe source –

7 or fewer Ingredients Recipes for Thanksgiving

Simple, Healthy and delicious ideas to make your Thanksgiving perfect. I’ve shared my recipes here. Enjoy.

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