In a large pot, bring salted water to a roaring boil. Add the pasta and cook according to the package instructions until it reaches a perfect al dente texture. Before draining, reserve 1/2 cup of the starchy pasta water. Drain the pasta and set it aside.
In a spacious skillet, drizzle the olive oil and heat it over medium heat. Add the diced chicken breasts, seasoned with salt and freshly cracked pepper. Sauté the chicken for approximately 7-8 minutes, or until golden brown and cooked through. Remove the chicken from the skillet and set it aside.
In the same skillet, add the minced garlic and sauté for about 1 minute until fragrant and slightly golden. Pour in the heavy cream and allow it to come to a gentle simmer.
Lower the heat and stir in the pesto sauce until thoroughly integrated. Gradually add the grated Parmesan cheese, stirring until melted and creamy. Adjust seasoning with salt and pepper as needed. If the sauce is too thick, incorporate the reserved pasta water until it reaches your preferred creaminess.
Add the drained pasta and sautéed chicken back into the skillet. Toss well to coat every piece of pasta with the creamy pesto sauce.
Gently fold in the halved cherry tomatoes, allowing them to warm through for about 2 minutes in the hot sauce.
Serve the creamy chicken pesto pasta in generous portions on plates or in bowls. Garnish with fresh basil leaves and an extra sprinkling of Parmesan cheese, if desired.
Notes
Adjust the thickness of the sauce with reserved pasta water as needed.