1. Preheat panini press.
2. Microwave jelly at HIGH 10 seconds or until it melts. Combine jelly and mustard; spread mixture evenly over 1 side of 4 bread slices. Layer 2 ham slices, 1 cheese slice, and 6 apple slices over mustard mixture on each bread slice; top evenly with remaining bread slices.
3. Coat sandwiches with cooking spray. Add sandwiches, 2 at a time, to panini press; grill 2 minutes or until toasted.