Preheat the oven to 350.
Quarter the onions and cut the green peppers into chunks about 1" in size. Cut the potatoes in half or quarters depending upon size. Place the vegetables in a bow or a zip lock bag.
Combine the Balsamic dressing, garlic powder and Oregano. Pour over the vegetables, mix and set aside.
Cut the sausage links into thirds or halves.
Place the vegetables and dressing into the dish. Top by spreading the sausage across the dish. Cover with foil and bake for 45 minutes.
Dice the roasted red peppers, slice the basil leaves and shred the mozzarella cheese.
After about 30 minutes remove the foil and top with shredded mozzarella. Check the potatoes with a fork.
Bake for about 15 more minutes, until the potatoes are cooked and the cheese is melted.
Top with roasted red peppers and basil. Enjoy!