Cook the pasta to very al dente. Reserve 1 cup of the pasta water.
Brown the chicken, set aside. Shred the zucchini while the chicken is browning (like on a cheese grater). Add olive oil to the same pan you browned the chicken in; saute garlic and onion til translucent. Add the zucchini, saute 2-3 minutes. Add the chicken back to the pan, reheat, and then add the hot pasta and about 1/2 the pasta water. Toss, adding more pasta water if it seems dry. If you have any parm cheese, throw a ton in at this point. Top with fresh parsley, if you have it.
I make this meal about once/week (usually with chicken breast instead of ground). Always a hit!