Cheesy Scalloped Potatoes

Ingredients (11)

• 3 tablespoons butter
• 3 garlic cloves
• 1 medium onion
• 2 tablespoons fresh thyme leaves
• kosher salt and freshly ground black pepper
• 2 cups heavy cream
• 1 cup chicken broth
• 4 pounds russet potatoes
• 3 bay leaves
• 1 cup medium cheddar cheese
• 2 cups Parmesan cheese