Melt butter in a large nonstick skillet over medium-high heat. Add onion; sauté 2 minutes or until brown. Add zucchini; sauté 2 minutes. Remove zucchini mixture from pan. Add wine to pan; cook until reduced to 1 tablespoon (about 1 minute), scraping pan to loosen browned bits. Combine wine reduction, sliced green onions, and next 7 ingredients (through prosciutto) in a large bowl. Add zucchini and pasta; toss to coat.