Place squash, cut side down, in microwave-safe dish. Add 2 tablespoons water. Cover tightly with plastic wrap. Microwave on high power 25 to 35 minutes or until tender. Let stand for 5 minutes.
Carefully remove plastic. Pull out squash strands with fork; place in large bowl.
Mix butter, broth, parsley, salt and pepper; add to squash. Serve.