I used Penne and all the vegetables I had including onion, red pepper, zucchini, yellow squash, mushrooms.
Cook the pasta less than al dente- I cooked it for 6 minutes, because it's going to finish it's cooking later in to the oven. Salt the water in which you are cooking the pasta.
Chop all the veggies and spread them on a baking pan which is lined with an aluminium foil. Season the veggies with salt and pepper and some olive oil. Mix well and arrange in a single layer.
Set the oven to 400F and roast the veggies for about 15 minutes.
In a bowl mix the cooked pasta, all the roasted veggies and marinara sauce. Fold in the cheeses. I used smoked mozzarella for it's smoky flavor and Parmesan for the beautiful crust.
Spread the mixture in a baking pan and bake for about 25 minutes or until the cheese melts and forms a nice golden crust on top.