In large skillet, cook turkey and onion over medium-high heat until meat is no longer pink and onions are tender.
Mix in garlic and cook for 45 second to 1 minute.
Mix in the salsa and seasonings and let simmer for 3 - 5 minutes.
Stir in cooked pasta, cream cheese and sour cream.
Continue stirring until cream cheese is melted and all ingredients are well blended.
Serve topped with shredded cheese.
Garnish with sour cream and salsa if desired.