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Potato Gratin with Caramelized Onions

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  • 4 large baking potatoes, peeled and halved
  • 2 tsp. salt
  • 4 Tbs. unsalted butter
  • 1/2 cup milk
  • 1/2 tsp. white pepper
  • 3 Tbs. olive oil
  • 2 large yellow onions, halved and  thinly sliced
  • 2/3 cup beef broth
  • 1 1/2 cups shredded Gruyère cheese


Preheat oven to 350°F.

Place the potatoes in a large pot and add water until potatoes are covered. Add the salt and boil until fork tender. Drain and transfer to a large mixing bowl. Mash potatoes with the butter, milk, and white pepper. Transfer potato mixture to a deep casserole dish lightly coated with cooking spray, leaving one-half-inch on top and around the edges for topping.

Meanwhile, heat the oil in a large skillet over medium-high heat. Add the onions and cook until soft and golden, stirring frequently, about 10 minutes. Stir in the broth and cook until onions are deep brown, about 5 more minutes. Season with salt and pepper.

Spread onions evenly over potatoes and top with the shredded cheese. Bake for 20 minutes or until cheese is bubbly.

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