Preheat oven to 400 degrees F.
Warm the sauce on the stove just until about room temperature.
Pour half into the bottom of the pasta pot you used to cook the pasta and veggies. Add in the drained pasta and veggies and the rest of the sauce, Gently stir to combine well. Taste and add more salt if needed. A little more salt will bring out the flavors.
Transfer the pasta/veggies/sauce mixture to a 13x9 glass baking dish. Top with breadcrumbs.
Bake the casserole for 15 minutes on the middle shelf, then move to the top shelf for 5 more minutes so the breadcrumbs get crispy. Serve warm!