Allow chicken breasts to sit at room temperature 20 minutes.
Mash softened cream cheese, Greek yogurt, chopped shallot, lemon zest, lemon juice, 3 tablespoons reserved mandarin juice, chopped parsley, salt and pepper. Set aside.
Preheat grill to high heat. Season chicken breasts with drizzle of olive oil, salt and pepper, to taste.
Grill chicken breasts until internal temperature reaches 165 F. Allow chicken to cool then dice into small chunks.
Bring medium or large pot of salted water to boil. Add macaroni and cook until tender. Drain and pour hot noodles into large mixing bowl.
Gently stir in cream cheese mixture until noodles are well coated. Let cool slightly.
Add diced chicken, apples and mandarin oranges; stir to combine. Serve warm or chill in refrigerator to serve cold.