Buffalo Chicken Meatloaf

Name: Buffalo Chicken Meatloaf
Ingredients: 3 tablespoons ketchup; 1 tablespoon hot sauce; Nonstick cooking spray, for spraying the loaf pan; 3 tablespoons unsalted butter; 3 stalks celery, small diced (about 1 cup), celery leaves reserved for garnish; 1/2 medium onion, small diced (about 1 cup); 3 tablespoons hot sauce; 1 1/2 pounds ground chicken, 50/50 light and dark; 1 cup blue cheese crumbles; 1 1/2 teaspoons kosher salt; 2 teaspoons coarsely ground black pepper; 2 large eggs; 2 1/4 cups panko breadcrumbs; 1/4 cup grated Parmesan