Cheeseburger Empanadas

Name: Cheeseburger Empanadas
Ingredients: 1/2 cup ketchup; 1/2 cup mayonnaise; 1/2 cup finely chopped dill pickle chips plus 18 whole dill pickle chips; 1/4 cup yellow mustard; Kosher salt and freshly ground black pepper; 1 tablespoon canola oil; 8 ounces ground beef chuck; 1/2 small red onion, finely chopped; 4 slices American cheese, roughly chopped; 1 large egg; One 1.1-pound package frozen puff pastry (2 sheets), thawed; All-purpose flour, for dusting