Heat oven to 400°F. Roll out pastry on lightly floured surface to 14x8-inch rectangle. Place on parchment-covered baking sheet; set aside. Mix remaining cream cheese with half of dry jelly powder; spread onto crust to within 2 inches of edges. Toss apples with cinnamon, corn starch and remaining dry jelly powder; spoon over cream cheese mixture. Fold edges of pastry over apples toward centre of tart. (Apples will remain exposed in centre.) Sprinkle with nuts.