French Onion Sliced Baked Potatoes: A Cheesy, Savory Step-by-Step Recipe

French Onion Sliced Baked Potatoes are a rich and comforting side dish inspired by the deep, savory flavor of French onion soup. Thinly sliced potatoes are baked with caramelized onions, butter, broth, herbs, and melted cheese until tender, golden, and full of flavor.

This dish is perfect when you want something more exciting than regular baked potatoes. It has the sweetness of slow-cooked onions, the softness of baked potatoes, the richness of butter, and the golden cheesy top that makes every bite satisfying.

What Makes This Recipe Special?

The key flavor comes from the onions. When onions are cooked slowly, they become sweet, golden, and deeply savory. When paired with potatoes, beef broth, thyme, and cheese, the result tastes warm and comforting, almost like French onion soup turned into a baked potato dish.

The sliced potatoes absorb the buttery onion broth while baking, so they become soft inside with lightly crisp edges on top.

Ingredients

For the Potatoes

• 5 to 6 medium potatoes, Yukon gold or russet
• 3 tablespoons butter, melted
• 1 tablespoon olive oil
• ½ teaspoon salt
• ½ teaspoon black pepper
• ½ teaspoon garlic powder
• ½ teaspoon dried thyme
• ½ teaspoon onion powder

For the French Onion Mixture

• 2 large yellow onions, thinly sliced
• 2 tablespoons butter
• 1 tablespoon olive oil
• 2 cloves garlic, minced
• ½ teaspoon sugar, optional
• ½ teaspoon salt
• ½ teaspoon black pepper
• ½ cup beef broth
• 1 teaspoon Worcestershire sauce
• ½ teaspoon dried thyme

For the Topping

• 1 cup shredded Gruyère cheese
• ½ cup shredded mozzarella cheese
• ¼ cup parmesan cheese
• Fresh parsley, optional

Step 1: Prepare the Potatoes

Wash the potatoes well and dry them completely. You can peel them, but keeping the skin on gives the dish more texture and helps the slices hold their shape.

Slice the potatoes thinly, about ⅛ to ¼ inch thick. Try to keep the slices even so they bake at the same speed.

Place the sliced potatoes in a large bowl.

Step 2: Season the Potatoes

Pour melted butter and olive oil over the potato slices.

Add salt, black pepper, garlic powder, onion powder, and dried thyme.

Toss gently until the potatoes are evenly coated. Be careful not to break the slices.

Set the potatoes aside while you prepare the onions.

Step 3: Caramelize the Onions

Place a large skillet over medium-low heat.

Add butter and olive oil. Once the butter melts, add the sliced onions.

Sprinkle with salt, black pepper, and a small amount of sugar if using. The sugar is optional, but it helps the onions brown a little faster.

Cook the onions slowly for 20 to 30 minutes, stirring often. They should become soft, golden, and sweet.

Do not rush this step. French onion flavor depends on slowly caramelized onions.

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