Measure ground beef into 5 ounce segments, and form into thin round patties, pushing center in with your thumb to depress. (This helps keep the burgers from bowing up in the center.)
Sprinkle patties on each side with salt, pepper, garlic powder, chili powder, cumin and paprika. Grill burgers over medium heat until cooked through, about 12 minutes total. Conversely, pan fry burgers over medium heat until cooked through, about 12 minutes, until juices run clear and the burgers have no raw meat remaining. Add a slice of cheese to each burger, and allow to melt off heat for 5 minutes.
Meanwhile, combine re-fried beans (I like the spicy vegetarian fat free beans the best) with the taco sauce and warm in microwave until cooked through.
Make chipotle mayo: remove one medium to large chipotle pepper from can and chop very fine. Combine with mayo, being sure to scrape the juices into the mixture as well. Add more adobo sauce as desired to spice and color mayo.
Lightly Toast or grill the inside only of the brioche buns.
Build your burgers: Place open bun on plate, spread a heavy tablespoon of the re-fried bean mixture on the base. Add cheeseburger, top with onion slice and avocado. Generously spread chipotle mayo on top bun and top burger. Enjoy!