Creamy Caramelized Onion & Parmesan Potato Gratin (Better, Richer, and Foolproof)

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If you’re looking for a side dish that feels luxurious, comforting, and impressive without being overly complicated, this potato gratin is exactly what you need.

This version takes the classic French gratin and elevates it with deeply caramelized onions and nutty Parmesan cheese, creating a dish that’s rich, silky, and packed with flavor in every bite.

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🥔 Why This Recipe Is Better

Richer Flavor

Caramelized onions add a deep, sweet-savory complexity you won’t get from a basic gratin.

Perfect Texture

Cream + potato starch creates a naturally thick, silky sauce—no flour needed.

Golden, Crispy Top

Parmesan melts and browns beautifully, giving you that irresistible crust.

Make-Ahead Friendly

Perfect for holidays, dinner parties, or meal prep.

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🧾 Ingredients

• 3 lbs potatoes (Russet or Yukon Gold), thinly sliced
• 2 tbsp butter (for onions)
• 2 large onions, thinly sliced
• 2 cups heavy cream
• 1 cup finely grated Parmesan (+ extra for topping)
• 1½ tsp salt (divided)
• 1 tsp black pepper
• 2 tsp fresh thyme (or 1 tsp dried)
• Butter or spray (for greasing dish)