Season the chicken breast with half of the salt and pepper, then grill or pan-sear over medium-high heat until the internal temperature reaches 165°F.
Transfer the chicken to a cutting board and let it rest for 5 minutes before slicing into small, bite-sized cubes.
In a small glass jar or bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, and the remaining salt and pepper until emulsified.
Halve the cherry tomatoes, dice the cucumber, and finely mince the red onion.
In a large mixing bowl, combine the cooked pasta, cubed chicken, tomatoes, cucumber, and red onion.
Drizzle the lemon vinaigrette over the salad and toss thoroughly to ensure every ingredient is well-coated.
Gently fold in the chopped fresh parsley and dill.
Serve immediately or refrigerate in an airtight container for up to 3 days for easy summer meal prep.