Black Bean Smash Burgers

Prepare the black beans - Preheat the oven to 350°F. Line a baking sheet with parchment paper. Open the can of black beans, reserve 1/4 cup of the bean liquid, then drain and rinse the beans. Spread the beans onto the prepared baking sheet in an even layer. Bake until dry to the touch and beginning to split, 6 to 8 minutes. Set aside to cool.

Chop the vegetables in the food processor - Meanwhile, place the mushrooms, onion, and jalapeño in the bowl of a food processor fitted with the blade attachment. Pulse until finely chopped, about 6 (1-second) pulses (a few larger pieces are okay).

Sauté the veggies - Heat 2 tablespoons of the oil in a large cast iron skillet over medium heat. Add the chopped vegetables and cook until golden brown and the liquid has evaporated, 10 to 12 minutes.

Add the seasonings - Reduce the heat to low. Stir in the soy sauce and scrape up any brown bits from the bottom of the pan. Add the garlic powder, cumin, hot sauce, salt, and pepper and cook for 30 seconds more. Remove from the heat.

Make the patty mixture - Meanwhile, wipe out the bowl of the food processor and add the tortilla chips. Process until finely ground, about 20 seconds (you should have 1/2 cup). Add the black beans (reserve the baking sheet) and process until mostly broken down, about 5 (1-second) pulses. Add the mushroom mixture and pulse until combined, about 3 (1-second) pulses. If the mixture looks too dry, add up to 2 tablespoons of the reserved bean liquid. The mixture should be on the dry side but hold together when formed without crumbling apart. Taste, and adjust the seasoning with salt and pepper.

Form into patties - Divide the mixture into 8 portions, a little over 1/4 cup each. Use your palm to flatten each one into 3-inch patties. Line the baking sheet with fresh parchment or plastic wrap and place the patties on top. Refrigerate while you prepare the sauce and toppings.

Make the sauce - Stir together the mayonnaise, mustard, ketchup, chopped pickles, and pickle juice.

Cook the burgers - Wipe out the cast iron skillet, if necessary. Heat 2 tablespoons of the oil over medium-high heat until nearly smoking. Place 4 of the patties in the pan and press down in gentle, short presses with a wide, solid spatula to form thin, 4-inch wide patties. If your pan isn't big enough, cook 2 patties at a time. Cook until the edges are browned and crisp, 2 to 3 minutes. Carefully flip the burgers (they will be fragile), top with the cheese, and cook until the second side is browned and the cheese is melted, 2 to 3 minutes more, lowering the heat as necessary. Transfer the burgers to a plate. Wipe out the skillet, heat the remaining 2 tablespoons of oil, and repeat with the remaining patties.

Assemble the burgers - Spread the smash sauce onto the bottom and tops of the toasted buns. Transfer 2 patties to each bottom bun and top with tomato, lettuce, sliced red onion, and pickles.