Cook pasta according to package instructions. Drain, but be sure to reserve 1/4 cup of the pasta water before draining.
While the pasta is cooking, heat the olive oil in a large skillet over medium heat. Sauté the carrots for a few minutes. Add the peppers and sauté for an additional few minutes. Add the squash and zucchini and saute for 2 more minutes.
Add the tomatoes, minced garlic, Italian seasoning, garlic salt, and pepper, and saute for another 2 minutes. (Note: if adding meat, then add it at this point. Be sure that it has been precooked and cut)
Toss in the bowtie pasta, 1/4 cup reserve pasta water, lemon juice, and any salt and pepper as needed.
Top with Parmesan Cheese, parsley, and balsamic glaze if desired.