Dice sausage and mix into large skillet with onion, green chili's, salt, pepper and garlic. Fry until onions are soft. Add chili power until it mixed and has coated the meat. Spoon meat mixture onto a paper towel to absorb grease.
Boil pasta until soft and rinse with cold water.
Cut up the box of cheese onto cubes and melt in the microwave. Stir about every two to three minutes to prevent burning.