Slice the bread open lengthwise and then cut into sandwich size.
Season the chicken breasts with the fajita seasoning (or homemade taco seasoning) and grill on both sides until cooked through. Let cool slightly, then slice into thin strips. (Save a step: use up your batch cooked grilled chicken slices.)
Saute the frozen peppers and onions with some fajita seasoning for about 3-5 minutes, or until the water has cooked off.
To assemble, spread the salsa on the bottom of the bread. Add the grilled chicken slices, then the sauteed peppers and onion, then the cheese slice.
Microwave or put under the broiler to melt the cheese.
Serve Chicken Fajita Melts with fresh fruit.