In large skillet, heat oil over medium heat. Add onion and bell pepper. Cook and stir 1 minute. Add sausages; continue cooking 5 minutes until browned and heated through, turning occasionally. Remove sausages from skillet.
Add potato salad and black pepper to skillet. Stir to combine with onion mixture. Return sausages to skillet. Cook 2-3 minutes until heated through. Sprinkle with parsley, if desired.
Serve sprinkled with parsley, if desired.