Heat 1 Tbs. of the oil in a 10-inch skillet over medium heat. Add the scallions, poblano, and garlic and cook until beginning to soften, 1 to 2 minutes. Transfer to a food processor. Add the beans and pulse 2 or 3 times to roughly chop. Be careful not to overprocess.
Transfer the mixture to a large bowl and gently mix in the cilantro, breadcrumbs, egg, chile powder, cumin, and 3/4 tsp. salt. Shape the mixture into 4 equal 3/4-inch-thick patties. Refrigerate, covered, for at least 30 minutes and up to 4 hours.
Heat the remaining 2 Tbs. oil in a large skillet over medium heat. Cook the burgers until nicely browned on both sides, flipping carefully, about 5 minutes total.
Serve with the Tomatillo & Avocado Salsa.
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