Cook the rotini pasta according to package instructions; drain and let cool.
Grill the chicken breast until fully cooked; slice it into strips.
In a large bowl, combine the cooled pasta and chopped romaine lettuce.
Add the sliced grilled chicken on top of the pasta and lettuce.
Drizzle Caesar dressing over the salad mixture and toss gently.
Season with salt and pepper to taste.
Sprinkle croutons and grated Parmesan cheese on top.
Optional: add cherry tomatoes or avocado for extra flavor.
Serve immediately or refrigerate for up to two hours before serving.