1-First Step: Marinate and Prepare Ingredients Start by combining balsamic vinegar, lemon zest, lemon juice, minced garlic, and olive oil in a bowl. Whisk continuously while gradually adding olive oil until creating a smooth vinaigrette. Stir in chopped parsley, then season with kosher salt and freshly ground black pepper to taste. Reserve some dressing separately for drizzling.

2-Second Step: Season and Marinate Chicken and Vegetables Coat chicken breasts, red bell peppers, and green onions in olive oil, then season generously with kosher salt and pepper. Optionally marinate chicken in half of the prepared vinaigrette for at least 30 minutes or overnight to boost flavor and tenderness.

3-Third Step: Preheat the Grill and Cook Ingredients Heat the grill to high. Grill chicken and red bell peppers covered for about 6 minutes per side or until the chicken is cooked through and peppers develop grill marks. Grill green onions for 3 minutes per side until tender and lightly charred. Remove from grill and let rest for 5 minutes.

4-Fourth Step: Cook Pasta While the grilled items rest, bring a large pot of salted water to a boil. Cook pasta according to package instructions (usually 8-12 minutes) until al dente. Drain pasta and immediately transfer to the bowl with the remaining vinaigrette while still warm, allowing it to absorb flavors for about 5 minutes.

5-Fifth Step: Combine Salad Ingredients Slice the grilled chicken thinly against the grain. Roughly chop grilled red peppers and slice green onions. Add chicken, peppers, green onions, basil leaves, halved grape tomatoes, and fresh mozzarella (if using) to the pasta. Gently toss to combine and blend flavors.

6-Final Step: Serve and Garnish Adjust seasoning with additional salt, pepper, or more vinaigrette if needed. Serve the grilled chicken pasta salad warm or chilled, topped generously with grated parmesan cheese and freshly cracked black pepper. Garnish with extra herbs if desired for freshness and color.