Bring a pot of salted water to a boil and cook the rotini pasta until al dente.
In a large pan, heat olive oil over medium heat.
Add the sliced cooked chicken and season with salt and pepper.
Sauté the chicken for 3-4 minutes until warmed through.
Once the pasta is cooked, drain and add it to the pan with the chicken.
Stir in the basil pesto, ensuring the pasta is well coated.
Cook for an additional 2 minutes, stirring continuously.
Remove from heat and sprinkle with grated Parmesan cheese.
Serve immediately, garnished with cherry tomatoes.