01 - Cook pasta in a large pot of salted boiling water according to package directions 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 pieces 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 skillet. Add drained pasta and cherry tomatoes. Toss thoroughly to coat everything in creamy pesto sauce. If sauce appears too thick, incorporate reserved pasta water one splash at a time until desired consistency is reached.
06 - Taste and adjust seasoning with additional salt and pepper as needed. Serve immediately, garnished with extra Parmesan and fresh basil if desired.