Preheat oven to 450 degrees
Spray baking dish with nonstick cooking spray
Put red onion, eggplant and zucchini in baking dish
Put in oven and bake for about 40 minutes or until the veggies start to brown (we will call these "browned veggies!")
While veggies are baking, combine remaining veggies into a large bowl (plus garlic). Pour entire can (with the juice) of tomatoes into bowl. Mix completely. Add spices and nutritional yeast (or parm cheese). Mix again (we will call this "mixed bowl"!)
Once baking veggies are done, remove from oven and transfer to a separate bowl
Pour "mixed bowl" into baking dish (be careful, dish is hot!) Spread veggies out completely
Layer "browned veggies" on top
Cover baking dish with tin foil and put in the oven for 40 minutes
After 40 minutes, remove tinfoil, and continue to cook for 30 minutes
Remove from oven and allow to coolENJOY!