Preheat oven to Broil – 500 degrees F and cover a sheet pan with parchment paper.
Slice red peppers around stem and lay flat, skin-side up, on parchment paper. Roughly chop onion, slice tomatoes in quarters and add to parchment paper. Drizzle with oil, sea salt, and garlic, if using.
Broil for 12-15 minutes, or until peppers are starting to char.
Add all contents from sheet pan to Vitamix A3300 blender, along with vegetable broth, nutritional yeast, basil and pepper. Tap the soup function on the touch screen and let blend until smooth (about 5 minutes, 45 seconds).
No need to heat up-- the blender does it for you! Serve with fresh basil, avocado, pepper and a sprinkle of nutritional yeast. Enjoy! :)