1. Shave squashes into thin strips using a vegetable peeler; place in a colander. Bring a large saucepan filled with water to a boil. Add pasta; cook 6 minutes. Add red onion; cook 2 minutes. Drain pasta mixture over squash in colander.
2. Return pan to medium-high heat. Add milk and flour; bring to a boil. Cook 1 minute or until slightly thickened, stirring constantly. Stir in cream; cook for 1 minute. Add pasta mixture, stirring to coat. Stir in the herbs, salt, and pepper. Serve immediately.