1. Preheat a waffle iron or Panini press on high for 4 minutes.
2. Place a paper towel on a microwave-safe plate. Arrange bacon on paper towel; cover with an additional paper towel. Microwave bacon at HIGH for 4 minutes or until done.
3. Combine mayonnaise and mustard in a small bowl. Spread about 1 1/4 teaspoons mayonnaise mixture over each bread slice.
4. Divide bacon, turkey, apple slices, and cheese evenly among the 4 Wonder® hamburger buns; top with remaining bread slices, spread side down.
5. Lightly coat both sides of burger buns with cooking spray.
6. Place sandwiches onto either a waffle iron or Panini press and cook 3 to 4 minutes or until golden brown and cheese melts.
7. Plate and enjoy!