Heat a skillet over medium heat.
Add the black beans to the skillet.
Season the beans with cumin, chili powder, salt, and pepper.
Cook the beans for about 5 minutes, stirring occasionally.
Warm the corn tortillas in a separate pan.
Mash some of the beans slightly for a creamier texture.
Fill each tortilla with a generous spoonful of the black bean mixture.
Top with diced tomatoes, onions, and cilantro.
Serve with lime wedges on the side.
Enjoy your delicious black bean tacos!