Scalloped Potatoes

Steps

1. Bring a large pot of salted water to a boil. Add potatoes and cook for 25-30 minutes, removing when still not quite tender. Drain and set aside until they are cool enough to handle (10-15 min).
2. In a small skillet, melt 1 tbsp butter over medium heat. Add onion and cook until transluscent and tender, about 5 minutes. Add garlic and cook for an additional 3 minutes. Transfer everything to a medium bowl and let cool.
3. Preheat oven to 350F. Grease a 9x13 baking dish.
4. Add Gruyère, Cheddar, Parmesan, Thyme, and 2 tsp salt and 1 tsp pepper to the bowl with the onion/garlic mixture. Mix until well combined.
5. Peel and slice potatoes 1/4" thick. Arrange 1/3 of the potatoes in the baking dish, overlapping when necessary. Sprinkle 1/3 of the cheese mixture, and continue with two more layers. Top with the remaining cheese. Pour the cream over the top of the potatoes and add bay leaves.
6. Bake until cream is mostly absorbed and the cheese on top is golden brown and bubbling, about 1 hour 15 minutes.
7. Let cool for 10 minutes, remove bay leaves, and serve.