Root Vegetable Gratin

Name: Root Vegetable Gratin
Ingredients: 3 cups heavy cream; 1 dijon packet (1 teaspoon); 3 sprigs thyme, leaves only; 2 garlic cloves, smashed; 1 red pepper flake packet (¼ teaspoon); 1 teaspoon salt; 1 teaspoon pepper; 1 cup grated parmesan cheese; 2 cups grated mozzarella cheese; 2 large red beets; 2 large golden beets; 2 orange sweet potatoes; 1 large purple sweet potato; 1 rutabaga; 1 turnip; 1 large russet potato; 2 tablespoons olive oil; 1 1/2 cups panko breadcrumbs; 2 tablespoons parsley; 2 tablespoons butter, melted