Drain the oil from the canned tuna and prepare it.
Finely chop the onion and bell pepper.
Add oil to a pan and sauté the onion and bell pepper.
Mix the sautéed vegetables with tuna, corn, salt, and pepper.
Place the prepared filling and cheese on a tortilla.
Fold the tortilla over the filling and grill it on both sides until golden brown.
Cut into bite-sized pieces.