Preheat the oven to 375°F (190°C).
Season the chicken pieces with salt and pepper. In a skillet, heat 2 tablespoons olive oil and cook the poultry for about 15 minutes, until cooked through. Set aside.
While the chicken is cooking, prepare the pasta according to the package instructions. Toss with the remaining tablespoons of olive oil and set aside.
In a bowl, mix the pesto, ricotta, and sour cream until smooth. Add the cooked chicken and pasta to the mix and toss to coat. Transfer the mixture to a large baking dish and sprinkle with the grated Parmesan on top.
Bake for about 30 minutes and serve. Enjoy!