Heat the oven to 400 degrees F. Unfold the pastry on a lightly floured surface. Roll the pastry sheet into a 10x15-inch rectangle. Cut the pastry sheet into 24 (2 1/2-inch) squares. Press the pastry squares into 24 (1 3/4-inch) mini muffin-pan cups.
Stir the kielbasa, marmalade and mustard in a medium bowl. Spoon about 1 tablespoon kielbasa mixture into each pastry cup.
Bake for 15 minutes or until the pastries are golden brown. Sprinkle the pastries with the parsley before serving.