Stir together your onion, garlic paste, and tomato sauce. Spread into the bottom of a 9 inch pan.
Line all of your chopped veggies in your dish. I started on the outer edge and worked my way in. Drizzle with olive oil and sprinkle with salt and pepper.
Cover your veggies with a piece of parchment paper slid just inside your baking dish. Bake for 30-45 minutes, or until your veggies are tender. Sprinkle with cheese and serve.
Notes
We like to used garlic paste for this recipe, however you could substitute that with minced garlic if needed.