MIX cream cheese spread and mustard until well blended.
PLACE 2 of the prosciutto slices, side-by-side, on work surface with long sides overlapping slightly. Top with 2 provolone slices; spread with 2 Tbsp. of the cream cheese mixture. Roll up from 1 of the short sides. Wrap tightly with plastic wrap. Repeat to make a total of 5 rolls. Refrigerate at least 2 hours.
CUT each roll into 8 slices. Place 1 slice on each cracker.