Cook pasta according to package directions, omitting salt and fat.
Sprinkle chicken with salt. Heat oil in a large nonstick skillet over medium-high heat. Add chicken; sauté 2 minutes. Add onion; cook 2 minutes, stirring frequently. Stir in cooked pasta, olives, oregano, and pepper; cook 2 minutes or until thoroughly heated. Remove from heat, and stir in cheese.