To make the Cooked Veggie Mix, sauté the onion and garlic in the oil in a large pan or pot over medium to high heat for 2 minutes. Add all of the remaining ingredients and cook for another 7 minutes. Let cool and store in an airtight container in the fridge.
To make the soup, cook the veggie mix, corn, tomatoes, and broth in a pot over medium to high heat for 5 minutes. Transfer to a bowl. Season with salt and pepper. Top the soup with the avocado, herbs, and a drizzle of olive oil.