01 - Slice bell peppers in half lengthwise, remove seeds and membranes, then pat dry with a paper towel.
02 - Spread hummus or mayonnaise and Dijon mustard evenly on the inside surface of each bell pepper half.
03 - Layer lettuce leaves, turkey breast slices, Swiss cheese, tomato slices, and red onion on one of the bell pepper halves.
04 - Season the assembled fillings lightly with salt and black pepper.
05 - Place the second bell pepper half over the fillings to create a sandwich.
06 - Insert toothpicks to secure if needed, serve immediately or wrap tightly for transport.