Boil pasta to package directions, al dente.
While water boils, slice chicken sausage links into coins and sauté in a skillet over medium high heat for 3-5 minutes, until browned. Remove from heat.
Add greens (if using) to a strainer. Once pasta is done, reserve about 1/4 cup of pasta water, and drain pasta over the greens. This will help to wilt the greens quickly without overcooking them.
Add the strainer of pasta and greens back to the pasta pot and stir in your pesto, cooked chicken sausage, reserved pasta water and if you want to, squeeze lemon juice into the pot.
Mix it all together and top with Parmesan cheese, black pepper and/or red pepper flakes, if using.