In a skillet, cook 2 cups corn until browned. Add 2 teaspoons oil and sliced scallion whites, cooking until scallions are tender. Season with salt and pepper. In a small bowl, combine mayonnaise and lime juice. Top hot dogs with corn mixture, lime-mayonnaise, crumbled cotija or feta and sliced scallion greens. Sprinkle with chili powder.
2 cups corn, fresh or frozen (thawed), 2 tsps. avocado oil, 2 scallions, sliced, white tops and greens, divided, salt and pepper, 2 tbsps. mayonnaise, 2 tsps. fresh lime juice, Cotija or feta cheese, chile powder