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French Onion Potato Bake

Quick & Simple Meals
This French onion potato bake combines the deep flavor of caramelized onions with creamy potatoes, thyme, and gooey cheese. Perfect as a show-stopping side dish or a vegetarian main, it’s indulgent, cozy, and crowd-pleasing.
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Prep Time 30 minutes
Bake Time 1 hour
Total Time 1 hour 30 minutes
Servings 6
Calories 400 kcal

Ingredients
  

For the Caramelized Onions:

  • 2 large yellow onions thinly sliced
  • 2 tablespoons butter
  • 1 tablespoon olive oil
  • 1 teaspoon salt
  • ½ teaspoon black pepper
  • 1 teaspoon sugar optional
  • ½ teaspoon garlic powder
  • ½ teaspoon dried thyme or 1 tsp fresh thyme
  • ½ cup beef broth or vegetable broth

For the Potato Bake:

  • 4 large Yukon Gold potatoes sliced ¼-inch thick
  • 1 tablespoon butter for greasing
  • 1 cup shredded Gruyère cheese or Swiss/cheddar/mozzarella
  • ½ cup Parmesan cheese grated
  • 1 cup heavy cream or whole milk
  • ½ teaspoon salt
  • ¼ teaspoon black pepper
  • 1 teaspoon fresh thyme leaves

For Garnishing:

  • Fresh thyme sprigs
  • Extra Parmesan
  • Crispy fried onions optional

Instructions
 

  • In a skillet, melt butter and olive oil.
  • Add onions, salt, pepper, sugar, garlic powder, and thyme.
  • Cook for 20–25 minutes until deeply golden.
  • Add broth and simmer 5 minutes. Set aside.
  • Preheat oven to 375°F (190°C). Grease a 9×13″ dish.
  • Slice potatoes and toss with cream, salt, pepper, and thyme.
  • Layer half of the potatoes, onions, and cheese.
  • See full steps with tips & photos → https://mischacrossing.com/french-onion-potato-bake/

Notes

  • Gruyère adds classic flavor, but cheddar or mozzarella work beautifully too.
  • Slice potatoes thin and evenly for perfect texture.
  • Make it vegetarian with vegetable broth.