01 - Cook pasta in a large pot of salted boiling water until al dente. Reserve 1/2 cup pasta water before draining.
02 - Heat olive oil in a large skillet over medium-high heat. Season chicken with salt and pepper, then sauté until golden and cooked through, approximately 6-8 minutes. Transfer to a plate and set aside.
03 - Reduce heat to medium and add butter to the same skillet. Sauté minced garlic for 1 minute until fragrant.
04 - Pour in heavy cream and bring to a gentle simmer. Stir in pesto and Parmesan cheese, mixing continuously until cheese melts and sauce achieves smooth consistency.
05 - Return chicken to the skillet. Add drained pasta and cherry tomatoes. Toss thoroughly to coat all components in the sauce. Add reserved pasta water as needed to achieve desired consistency. Adjust seasoning with salt and pepper to taste.
06 - Plate immediately, garnished with additional Parmesan and fresh basil leaves if desired.