Truffled Cauliflower Gratin - Olive This!

Ingredients

• 1 large head cauliflower
• 3 tablespoons unsalted butter, divided
• 1 ½ teaspoons Olive This! White Truffle Oil
• 3 tablespoons all purpose flour
• 1 cup hot milk
• 1 cup hot half & half
• ½ teaspoon freshly ground black pepper
• 1 cup freshly grated Gruyere cheese, divided
• ½ cup freshly grated Parmesan
• ½ cup fresh bread crumbs
• Kosher salt and fresh ground pepper to taste
• Chopped parsley for a garnish