Bring a large pot of salted water to a boil. Boil the pasta as directed on the package.
Meanwhile while the pasta is boiling, toss the slices of zucchini and sliced tomatoes with the olive oil on a baking sheet; season with some salt and pepper. Roast the vegetables until tender, about 20 minutes.
While the vegetables are roasting and the pasta is boiling, in a large bowl, combine the Parmesan cheese, sour cream and pesto. Drain pasta. Add pasta and chicken to Parmesan mixture; toss to coat. Add roasted vegetables when done and toss again, gently to coat.