Prepare pastry shells according to package directions.
Heat oil in 10" skillet over medium-high heat. Add onion and cook until it's tender, stirring occasionally.
Stir soup, milk and peas and carrots in skillet and heat to a boil. Reduce heat to low. Cover and cook 5 minutes or until vegetables are tender. Stir in turkey and cook until mixture is hot and bubbling. Spoon turkey mixture into paxtry shells. Top with pastry "tops," if desired.