01 - Whisk together vegan mayonnaise, minced chipotle peppers, adobo sauce, lime juice, and salt in a small bowl. Cover and refrigerate until serving.
02 - Place drained black beans in a large bowl and mash with a fork or potato masher, leaving some texture for bite.
03 - Add red onion, garlic, oats, breadcrumbs, cilantro, tomato paste, cumin, smoked paprika, chili powder, salt, and black pepper. Mix until thoroughly combined.
04 - Divide mixture into 4 equal portions and shape into burger patties. If mixture feels too wet, add extra breadcrumbs 1 tablespoon at a time.
05 - Heat olive oil in a large skillet over medium heat. Cook patties for 4-5 minutes per side until golden brown and heated through.
06 - Lightly toast burger buns in the skillet or under a broiler for 1-2 minutes if desired.
07 - Spread chipotle mayo on each bun. Place black bean patty on bottom bun, then layer with lettuce, tomato, onion, and avocado. Top with bun and serve immediately.