2. Brush the chicken breasts with olive oil and then season with salt and pepper. Cook them on the grill, about 4-5 minutes per side, depending on the thickness of the breast. Transfer the chicken to a cutting board to let cool and then slice on the bias.
For the sandwiches:
3. In a small mixing bowl, combine the cream cheese, scallions, chili peppers, and cilantro. Add salt and pepper to taste.
4. Lay out the sandwich buns on a work surface in front of you. Divide the cream cheese mixture among the sandwiches, spreading it out on each side of the bun. Divide the chicken slices among the sandwiches, top with one slice of avocado and one slice of tomato.
5. Slice the sandwiches on the diagonal and serve.