Created by ForeverMama on July 5, 2017
Step 1: Heat the oven to 350°.
Step 2: In a large saucepan, heat the cream with the butter and bay leaves over medium-high.
Step 3: Stir in the garlic, carrots, potatoes, onion, and celery root and bring to a boil.
Step 4: Reduce the heat to maintain a steady simmer and cook, stirring gently, until tender but not breaking, about 18 minutes.
Step 5: Remove the pan from the heat, stir in the thyme, and scrape into a 3-qt. round baking dish. Season the gratin with salt and pepper.
Step 6: Using a box grater, grate the Gruyère into a medium bowl and then toss with the bread crumbs.
Step 7: Sprinkle the cheese and bread crumbs over the vegetables and bake until the topping is golden brown and the gratin is bubbling in the center, about 30 minutes.