Pour the minced chipotle peppers, white vinegar, tamari sauce, and maple syrup into a small mixing bowl and mix. Set aside.
Preheat oven to 400F (190 degrees Celsius). Place the broccoli florets, eggplant slices, and sliced peppers in a baking dish. Drizzle with sesame oil, half of the spring onions, and the minced garlic. Season with oregano and toss to combine and coat all the vegetables in seasoning and oil.
Bake the vegetables in the oven for 30 minutes total - after 20 minutes of baking, remove the vegetables from the oven, drizzle the sauce over, and top with sesame seeds. Use a mixing spoon to combine and return the vegetables to bake for 10 more minutes, or until the broccoli is browned and just lightly charred in places.
Serve the vegetables topped with a garnish of fresh basil and the remaining spring onions as a side salad that will have everyone eating their veggies, top it over steaming rice or warm noodles, or eat it just as is as a healthy nutrient-rich bowl of deliciousness.