Meatball Mummies

Name: Meatball Mummies
Ingredients: Nonstick cooking spray, for the baking sheets; 1 pound 85 percent lean ground beef; 4 ounces spicy Italian sausage, casings removed; 1/2 cup dried breadcrumbs; 1/2 cup finely grated Parmesan, plus extra for garnish; 2 tablespoons whole milk; 1 teaspoon dried oregano; 1/2 teaspoon dried chile flakes; 1/2 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 3 tablespoons olive oil; 1 medium egg, beaten; One 17.3-ounce box frozen puff pastry sheets, thawed; Ketchup and mustard, for the eyes