Cook the whole wheat rotini pasta according to package instructions until al dente.
Drain the pasta and rinse it under cold water to stop the cooking process.
In a large bowl, combine the cooked pasta, grilled chicken, cherry tomatoes, bell peppers, and red onion.
In a small bowl, whisk together olive oil and balsamic vinegar.
Pour the dressing over the pasta mixture and toss to combine.
Add crumbled feta cheese and sunflower seeds to the salad.
Season with salt and pepper to taste.
Chill the salad in the refrigerator for at least 30 minutes before serving.
Serve cold or at room temperature for the best flavor.
Enjoy your nutritious high protein pasta salad as a meal or side dish!