Cook pasta in salted water according to package directions, reserve 0.25 cup pasta water before draining.
Meanwhile heat half the oil in a skillet over medium-high heat.
Add red onion and carrot and sauté 2 minutes.
Add broccoli and bell pepper then sauté 2 minutes.
Add green beans (or squash) then sauté 2 - 3 minutes
Add garlic, tomatoes, and Italian seasoning and sauté 2 minutes longer.
Pour veggies into now empty pasta pot or a serving bowl, add drained pasta, drizzle in lemon juice season, half the Parmesan, parsley, salt, and toss while adding in pasta water to loosen as desired
Serve with reminding Parmesan on top