French Onion Potato Bake: A Creamy, Cheesy, Flavor-Packed Side Dish

If you love the rich, savory taste of French onion soup and the comforting creaminess of baked potatoes, then this French Onion Potato Bake is the ultimate dish for you! Packed with tender potatoes, caramelized onions, creamy sauce, and gooey melted cheese, this dish is the perfect side for any meal—or even a meal on its own!

Whether you’re looking for a crowd-pleasing holiday side dish or an easy weeknight comfort food, this recipe is simple, delicious, and guaranteed to impress.

Why You’ll Love This Recipe

Bold French Onion Flavor – Caramelized onions and rich seasonings create an irresistible taste.
Creamy & Cheesy – Loaded with a luscious cream sauce and melty cheese.
Perfect for Any Occasion – Great for holidays, potlucks, or a cozy family dinner.
Easy to Make – Simple ingredients and minimal prep time.

Ingredients You’ll Need

2 lbs potatoes, thinly sliced (Yukon Gold or Russet work best)
2 large onions, thinly sliced
3 tablespoons butter
1 tablespoon olive oil
1 teaspoon salt
½ teaspoon black pepper
½ teaspoon garlic powder
1 teaspoon dried thyme (or ½ teaspoon fresh thyme)
1 cup beef broth (or vegetable broth for a vegetarian version)
1 cup heavy cream
1 cup shredded Gruyère or Swiss cheese (cheddar works too!)
½ cup shredded mozzarella cheese
¼ cup grated Parmesan cheese
1 cup crushed French fried onions (for that classic crunch!)

How to Make French Onion Potato Bake

Step 1: Caramelize the Onions

In a large skillet, heat butter and olive oil over medium heat.
Add sliced onions and cook slowly, stirring occasionally, for 15-20 minutes until they become soft and golden brown.
Season with salt, pepper, garlic powder, and thyme, then pour in ½ cup beef broth and let it simmer for 2 minutes. Remove from heat.

Step 2: Prepare the Potatoes

Preheat your oven to 375°F (190°C) and grease a 9×13-inch baking dish.
Arrange half of the sliced potatoes in the baking dish.
Spread half of the caramelized onions over the potatoes.
Sprinkle with half of the Gruyère and mozzarella cheese.

Step 3: Make the Creamy Sauce

In a small saucepan, warm the heavy cream and remaining ½ cup of beef broth over low heat.
Pour half of this mixture over the first potato layer.
Repeat the layering process with the rest of the potatoes, onions, and cheese, then pour the remaining cream mixture on top.

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