Step 1: Sauté pepper and onion
In a medium pan over medium-high heat, heat oil until shimmering. Add 1/2 of the bell pepper and 1/2 of the onion and sauté for 7 to 8 min. until onions are translucent and peppers are soft. Add Minced Garlic and sauté until garlic is fragrant, about 1 min. Remove from heat and reserve.
Step 2: Form burger patties
Line a sheet tray with parchment paper and set aside. In a large bowl, mash black beans thoroughly with a fork or potato masher, leaving only a few whole beans. Add bread crumbs, Mexican Street Corn Seasoning, eggs, and cooked pepper mixture. Mix thoroughly and form into 4 large or 8 small burger patties. Set patties on prepared sheet tray, cover, and refrigerate for at least 30 min. or up to overnight.
Step 3: Make corn salsa
In a medium bowl, combine corn, jalapeño, lime juice, and reserved uncooked pepper and onion. Mix until well-combined. Cover and chill until ready to use.
Step 4: Grill burgers
Preheat grill or grill pan for medium-high heat. Grill burgers for 4 to 5 min. per side until golden brown and crispy.
Step 5: Assemble and serve
Layer burgers on buns with corn salsa and crumbled cotija cheese.