Cook butternut squash according to package directions.
Insert steel knife in food processor. Add squash, cream cheese, Parmesan cheese, and black pepper. Process until smooth.
With the processor running, add water through the feed tube and process until fully mixed. Set aside.
Cook and drain 1 pound of your favorite pasta. Place pasta in a casserole dish. Add the sauce and mix thoroughly. Chill several hours or overnight to let sauce absorb into pasta.
Reheat in microwave oven. Makes eight generous servings.