Steps
1. Preheat grill or grill pan.
2. Season the chicken breast with salt and pepper.
3. Grill the chicken breast for about 6-8 minutes on each side, or until cooked through.
4. While the chicken is cooking, slice the avocado and prepare any optional toppings.
5. Toast the bread slices.
6. Once the chicken is done, let it rest for a few minutes, then slice it into thin strips.
7. Assemble the sandwich by placing the sliced chicken, avocado, and bell pepper on one slice of bread.
8. Add any optional toppings and top with the other bread slice.
9. Cut the sandwich in half and serve.