Preheat oven to 400℉ and line 2 baking sheets with foil. Cut off the stem from each pepper and slice in half, vertically. Using a paring or sharp knife, cut out the seeds and ribs and set aside.
In a medium bowl, combine the cream cheese, chorizo, chihuahua cheese, green onions, and cilantro. Mix until well blended. Use a spoon to fill each pepper with the chorizo mixture and place on the baking sheets, spaced evenly apart.
Bake for 15 minutes, then remove from oven and let cool slightly before serving.