Heat 2 tbsp olive oil in a wide pan over medium heat.
When it becomes hot, add the chopped onion. Stir fry the onion till it becomes a bit soft.
Add the garlic and stir fry for 1 minute.
Add the bell pepper. Stir fry for 1-2 minutes.
Add the jalapeño. Stir fry for 1 minute.
Add the mushrooms. Add ½ tsp salt. Mix well.
Allow the mushrooms to wilt a bit.
Add the corn and beans. Mix well. Let them become a bit hot.
Add the remaining ½ tsp salt and mix well.
Now add all the dry spices and oregano. Add red chilli, paprika, cumin, coriander powders. Also add the oregano.
Mix well. Stir fry the mixture for 1-2 minutes.
Add 1 cup of thick salsa roja. Mix well.
Allow the mixture to become hot.
Add the chopped white part of the spring onion and the cilantro, Mix well.
The filling is ready. Allow it to cool down a bit.