Start by preheating the oven to 450F.
In a large skillet or pot, heat the olive oil. Add the diced onion and peppers.
Cook for 3-5 minutes before adding in the taco seasoning.
Mix everything together so the seasoning coats the veggies.
Add the black beans with any liquid from the can to the veggies. Cook for 2-3 minutes and then mash half of the beans with a potato masher.
Pour in the corn and toss well.
Remove the mixture from the stove to cool slightly.
Take the corn tortillas and place them into the oven for 1 minute to warm. This makes them pliable and easier to work with.
Spray a sheet pan with oil. Put a few tortillas onto the sheet pan and toss them to coat both sides in the oil.
Place some of the bean mixture on one side of the taco. Add shredded cheese on top and fold the tortilla in half.
Continue with the rest of the tortillas.
Bake for 8-10 minutes. Remove the pan from the oven and flip the tortillas to the other side. Bake for an additional 8-10 minutes.
Allow the tacos to cool for a few minutes before serving.