Heat 1/2 tbsp oil in a pan, add 1 tbsp soy sauce, onion, garlic, pepper, and mushrooms and fry over medium heat for 3-4 minutes. Add the corn, black beans, and spice mix and fry for a further 3-4 minutes.
Make a batch of my easy vegan cheese sauce and spread some of it in an even layer on one tortilla. You can use any other vegan cheese of choice.
Add a layer of the veggie mixture (about 4 tbsp) and place another tortilla on top.
Transfer to a (lightly oiled) skillet and cook for about 2-3 minutes, flip and cook from the other side until both sides are nicely browned and toasty.