Discard the stalks, seeds and membrane from the chilies and soak in hot water for a few minutes.
Now put the chilies in a blender with the garlic, salt, oregano, ½ cup water and some chicken bouillon powder if using.
Blend until smooth.
Heat the oil in a pan and add the chili mixture.
Simmer for about 8 minutes and then let it cool.
Mix ¾ of the cheese with the onion and oregano.
Heat the oil in a pan and fry the tortillas lightly. Drain on paper towels.
Dip a tortilla into the sauce
Then stuff with the cheese mixture and roll up.
Repeat with the rest, then top with more cheese and serve.
Enjoy!