Heat 1 tablespoon of olive oil in a large skillet over medium-low. Add in the onion and sauté for 3-4 minutes until turning translucent. Add in the minced garlic and cook for another 1-2 minutes.
Season with cumin, paprika, salt, and pepper to taste, then remove from heat. Add the cooked black beans to a large mixing bowl and roughly mash them. Stir in the onion mixture and combine well.
Once the filling is mixed together, add about ½ - 1 more tablespoon of oil into the skillet and turn it to medium heat. Add 1-2 corn tortillas in a single layer and cook on the first side for about 10 seconds (the amount of tortillas you can cook at a time will depend on your pan).
Then, scoop about 3-4 tablespoon of bean mixture onto one half of each tortilla. You can also add some grated vegan cheese on top if you want. Using a spatula, fold the tortillas in half and press down to shape the tacos. Cook on each side until golden brown, about 1-3 minutes.
Continue cooking the tacos following this process until all the bean mixture is gone. Make sure to top up the oil as your pan dries out.