Prepare the Pasta: Bring a large pot of salted water to a boil. Add cooked pasta and cook until al dente, around 8-10 minutes. Drain and rinse under cold water.

Grill the Chicken: Heat the grill to medium-high, season chicken with salt and pepper, grill for 6-8 minutes until cooked through. Let rest, then dice.

Chop the Vegetables: Dice the cucumber, bell peppers, and red onion; halving the cherry tomatoes. Mix with cooled pasta and chicken.

Whisk the Dressing: Combine olive oil, lemon juice, Parmesan, salt, and pepper in a bowl, whisk until creamy.

Combine Salad and Dressing: Toss the salad mixture with dressing until evenly coated.

Garnish and Serve: Sprinkle parsley over the salad and serve chilled or at room temperature.