Preheat a grill or stovetop grill pan over medium-high heat.
Season the chicken breast with salt and pepper.
Drizzle a little olive oil over the chicken breast to prevent sticking on the grill.
Grill the chicken breast for approximately 6-8 minutes per side or until fully cooked and no longer pink in the center.
Remove the chicken from the grill and let it rest for a few minutes.
Once the chicken has rested, slice it into thin strips.
Lay out the slices of bread on a clean work surface.
Spread a generous amount of Caesar dressing on one or both slices of bread, according to your preference.
Layer the romaine lettuce leaves on one slice of bread.
Place the sliced grilled chicken on top of the lettuce.
Sprinkle grated Parmesan cheese over the chicken.
Optionally, drizzle a little more Caesar dressing over the chicken for extra flavor.
Close the sandwich with the other slice of bread, dressing-side down.
Press the Homemade Chicken Caesar Salad Sandwich gently together.
If desired, you can slice the sandwich diagonally into halves or quarters for easier eating.
Serve the sandwich immediately and enjoy the delightful combination of flavors!