Heat up the oil in a pan on medium high heat
Add tortilla strips, few strips at a time. Don't crow the pot
Fry it for 2 to 3 minutes till the strips are brown and crispy.
Remove the tortilla strips and place the over some paper towels to drain the oil.
In the same pan, add in the pasilla chilies and fry for about 2 minutes, without burning them.
Fry pasilla chiles in the same pan, being careful not to burn them, until browned, about 2 minutes.
Remove from the pot and drain over paper towels
In a blender, add in 1 fried pasilla pepper, tomatoes, onion, garlic and oregano. Run the blender till you get a smooth consistency
Heat about a teaspoon of oil over medium heat in a deep pot.
Add the prepared pasilla mix into the pot and cook for 2 minutes
Add the water. When it starts to boil, add the parsley and bouillon granules.
Cover and simmer for 15 minutes. By now all the flavors would be blended in.
Take it off heat and remove the parsley
In 4 separate bowls, add in equal parts of the tortilla strips
Add in the soup on each bowl, along with avocado and cotija cheese and sprinkle cut up strips of the remaining pasilla peppers on the soup.
Add the fresh cream on each bowl. This step is optional. Serve while still hot.