01 - Combine drained black beans and corn kernels in a skillet over medium heat. Stir frequently until warmed through, approximately 3 to 4 minutes.
02 - Remove skillet from heat and fold in diced red onion and chopped cilantro to the filling mixture.
03 - Heat corn tortillas in a dry skillet or microwave until pliable.
04 - Distribute the bean and corn mixture evenly across tortillas.
05 - Top with salsa, hot sauce, and lime wedges if desired. Serve immediately.