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French Onion Potatoes Recipe

French Onion Potatoes is a decadent, savory casserole that takes the rich, comforting flavors of French onion soup and pairs them with cheesy, creamy potatoes. Topped with crispy homemade fried onions, this dish is a show-stopping side perfect for holidays, potlucks, or cozy family dinners. It’s hearty, flavorful, and guaranteed to impress!

  • Total Time: 1 hour 20 minutes

Ingredients

Scale

Potatoes

  • 32 ounces frozen cubed hash browns, thawed

  • ¼ cup (57 g) unsalted butter, melted

  • 2 cups (226 g) sharp cheddar cheese, shredded

  • 1 ½ cups (345 g) sour cream

Sauce

  • ¼ cup (57 g) unsalted butter

  • 1 small yellow onion, diced

  • 2 teaspoons garlic, minced

  • ¼ cup (31 g) all-purpose flour

  • 1 teaspoon kosher salt

  • ½ teaspoon black pepper

  • ½ teaspoon cayenne pepper

  • ½ teaspoon dried mustard

  • ½ cup (120 g) chicken broth, room temperature

  • ½ cup (122.5 g) whole milk, room temperature

Fried Onions

  • 2 large yellow onions, thinly sliced, layers separated (about 4 cups onions)

  • 4 cups (32 ounces) vegetable oil

  • ½ teaspoon kosher salt

Instructions

  1. Preheat oven to 350°F. Spray a 9×13-inch baking dish with nonstick spray.

  2. In a large bowl, combine the thawed hash browns, melted butter, shredded cheese, and sour cream. Mix well and set aside.

  3. In a medium non-stick skillet, melt butter over medium heat. Add diced onions and cook for 3-5 minutes until softened. Add garlic and cook for 1 more minute.

  4. Add flour, salt, pepper, cayenne pepper, and dried mustard. Cook for 1 minute. Slowly add chicken broth and milk while whisking. Continue whisking until the sauce thickens.

  5. Pour the sauce into the potato mixture. Stir until fully combined, then transfer to the prepared baking dish.

  6. Bake for 45-50 minutes, until bubbly and heated through.

  7. While the casserole bakes, prepare the fried onions. Line a baking sheet with paper towels. Heat oil to 350°F in a large saucepan.

  8. Working in batches, fry about 1 cup of onions at a time for 2-5 minutes or until golden brown. Remove with a slotted spoon and place on the prepared baking sheet. Repeat with remaining onions, maintaining oil temperature.

  9. Sprinkle fried onions with salt and toss to coat evenly.

  10. Once the casserole is done, remove it from the oven and top with the fried onions. Serve immediately.

  • Author: Paula
  • Prep Time: 30 minutes
  • Cook Time: 50 minutes
  • Category: Side Dish / Casserole
  • Cuisine: American Comfort Food

Nutrition

  • Serving Size: 10-12 servings
  • Calories: Approximately 350 per serving