Gemeli have a pleasing texture, but any pasta will work in this healthy meal in a bowl. Substitute some veggies, tofu or beans for the chicken to make this a meat-free meal.
To make the pesto, place the walnuts, garlic and kale in the bowl of a food processor. Pulse until coarsely chopped. With the motor running, drizzle in the olive oil to form a smooth sauce. Season with the salt, chili flakes, orange zest and juice. Pulse in the Parmesan. Pour the pesto into a large bowl and set aside.
Bring a large pot of salted water to a boil. Cook the gemelli for 8-10 minutes or until al dente. Drain the pasta, reserving 1 cup of the pasta water. Add the hot pasta to the bowl with pesto. Toss well with a rubber spatula to coat. Add the chicken, cerignolas, kalamatas, salt and Parmesan. Mix again, loosening with the pasta water as needed. Finish with a drizzle of olive oil if desired.