In a large pot, heat the oil on medium heat, add the chicken and cook, stirring often until no longer pink. Remove chicken to a bowl and set aside.
Same pot, add the peppers and onion, cook, stirring often, until the onion is soft.
Add the chicken back to the pot and mix in the salt, pepper, cumin, garlic powder, and chili powder.
When everything is coated well, add the milk and pasta. Stir together and cook for about 20 to 30 minutes, stir often to prevent the pasta from sticking together.
Cook until the pasta is tender and the sauce reduced.
Add the cheese and mix in, no one will care if you use more cheese.
When the cheese is melted and mixed in, serve.