1. Heat olive oil in a large skillet over medium high heat. Add the onions, bell peppers and salt and cajun spice and cook until tender stirring occasionally. Add the garlic and cook for one minute. Meanwhile cook the pasta in salted water according to package directions
2. Place the veggie mixture into a food processor with sour cream, cilantro, green chilies, cheese, cayenne and black pepper. Puree until smooth scraping the sides as needed.
3. Toss the pasta with the sauce. Plate and garnish with cilantro.