Ingredients
Method
Preparation
- Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch glass casserole dish with 1 tablespoon butter or cooking spray.
- In a large skillet, melt 2 tablespoons of butter over medium heat. Add the sliced onions and 1/2 teaspoon of salt, and cook for 20–25 minutes until soft and golden brown.
- In a medium bowl, whisk together the heavy cream, 1 cup grated Parmesan, 1 teaspoon salt, black pepper, and thyme. Mix in the caramelized onions.
- Slice the potatoes thinly and layer them in the greased casserole dish.
Baking
- Pour the creamy mixture over the potatoes and sprinkle with remaining Parmesan.
- Cover with foil and bake for 45–55 minutes until fork-tender.
- Remove foil and bake for another 15–20 minutes until golden and bubbly.
- Let rest for 10 minutes before serving.
Notes
For a richer flavor, try using half-and-half instead of heavy cream. You can add more cheese for a cheesier version, such as cheddar or gouda. Consider making the onions ahead of time to save preparation time.
