Preheat oven to 350°F (175°C). Roast black beans in a single layer until mostly split open and slightly crunchy, ~20 minutes.
Heat oil over medium-high heat until shimmering. Add onion and poblano and sauté ~5 minutes.
Add garlic and cook ~2 minutes.
Add chipotle chile and sauce and cook ~30 seconds.
Transfer mixture to a large bowl.
Pulse cashews in a food processor until chopped into pieces no bigger than ⅓”, about 12 short pulses.
Add to bowl with onions & peppers.
Pulse beans and cheese until beans are roughly chopped (same size as cashews).
Add to bowl with onion/pepper mixture.
Add breadcrumbs, and [vegan sour cream]. Mix gently. Taste & season with salt, pepper, miso, aminos.
Form into patties. Add a bit of extra flour and/or Xantham gum if it doesn’t hold together enough. (A bit at a time, combining well in between.) Use English muffin forms & pack in for an extra shaped burger. (3.5-4” should fit a typical burger bun)
To cook:
a) Indoors: Heat 1 tablespoon oil in a nonstick or cast iron pan over medium heat. Add patties and cook until well browned and crisp on first side, ~5 minutes. Carefully flip and cook until second side is browned, ~5 minutes more.
b) Grill: Brush top sides of patties with oil. Place on hot side of grill, oiled-side down, and cook without moving until first side is well browned (3 to 5 minutes). Brush tops of burgers with oil. Carefully flip and continue cooking until second side is browned, 3 to 5 minutes longer, topping with cheese if desired.
