Drain and rinse the black beans thoroughly, then place them in a medium bowl and mash with a fork until mostly smooth but with some texture remaining.
Stir in the frozen corn, egg whites, nutritional yeast, oat flour, ground cumin, garlic powder, onion powder, sea salt, and black pepper until the mixture is well combined.
Form the bean mixture into two equal-sized patties, pressing firmly with your hands so they hold their shape.
Heat the extra virgin olive oil in a non-stick skillet over medium heat and cook the patties for 5 to 6 minutes per side until they are golden brown and firm.
In a separate small bowl, whisk together the non-fat Greek yogurt, lime juice, and chopped fresh cilantro to create a zesty topping.
Serve the warm patties immediately on a plate, dolloped generously with the chilled yogurt sauce.