1. In 12-inch skillet over medium heat, heat Italian-sausage links with water to boiling. Cover and cook 5 minutes. Remove cover; continue cooking, turning sausages frequently, until water evaporates and sausage links are well browned, about 20 minutes. Remove sausages to paper towels to drain.
2. Pour off all but about 3 tablespoons fat from skillet; add green peppers, onions, salt, and oregano leaves; over medium heat, cook, stirring frequently, until vegetables are tender.
3. Add cooked sausage links to vegetables; heat through.