Caramelized Onion Mashed Potato Bake

Give your mashed potatoes a little something extra with the addition of caramelized onions, Gruyère cheese, and fresh parsley. It takes only seven ingredients and two simple steps to make rich, fluffy mashed potatoes. So what happens when we added three more ingredients and one easy step? We ended up with this savory take: the Caramelized Onion Mashed Potato Bake.Even in the South, we know that mashed potatoes should be more than just an excuse to eat gravy. By infusing creamy, dreamy potatoes with caramelized onions and nutty Gruyère, then finishing them in the oven, we're making a statement: No gravy needed here. For the absolute creamiest texture, use warm liquids whether stock, cream, or milk instead of cold liquids when you begin mashing the potatoes. Serve this potato casserole recipe at your next dinner party with juicy pork tenderloin and home-style green beans, and prepare to really wow the crowd.

Hands On Time:
25 mins
Total Time:
50 mins
6 to 8 servings


  • 4 pounds baking potatoes

  • 2 teaspoons salt

  • 1 1/4 cups warm buttermilk

  • 1/2 cup warm milk

  • 1/4 cup melted butter

  • 1/2 teaspoon pepper

  • 1 teaspoon salt

  • 1 1/4 cups freshly grated Gruyère cheese

  • 1 cup chopped caramelized onion

  • 2 tablespoons chopped fresh parsley


  1. Peel potatoes; cut into 2-inch pieces. Bring potatoes, 2 tsp. salt, and water to cover to a boil in a large Dutch oven over medium-high heat; boil 20 minutes or until tender. Drain. Return potatoes to Dutch oven, reduce heat to low, and cook, stirring occasionally, 3 to 5 minutes or until potatoes are dry.

  2. Mash potatoes with a potato masher to desired consistency. Stir in warm buttermilk, warm milk, melted butter, pepper, and 1 tsp. salt, stirring just until blended.

  3. Stir in Gruyère cheese, caramelized onions, and parsley, and spoon the mixture into a lightly greased 2 1/2-qt. baking dish or 8 (10-oz.) ramekins. Bake at 350° for 35 minutes.

    Caramelized Onion Mashed Potato Bake
    Jennifer Davick
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