Place the chilies under the broiler and let the skin char on all sides. Remove to a paper bag. Close the bag and let the chilies cool and steam for a half an hour. Remove from bag and gently remove the charred skin trying to keep the pepper intact.
Stuff the pepper with the shredded cheese enclosing the end with a tooth pick. Place in sprayed baking dish.
Brown the chorizo in a skillet until done. Drain. Sprinkle over the chilies. Add the cans of tomatoes, garlic, and beef bouillon to food process. Process until smooth. Pour over chilies.
Bake at 350 degrees for 20 minutes. Sprinkle top with more shredded cheese. Bake another 5 minutes until cheese has melted. Top with sour cream Garnish with cilantro and serve.