Preheat the oven to 350°F (175°C).
Combine graham cracker crumbs, sugar, and melted butter in a bowl.
Press the mixture into taco molds or shape into shells on a baking sheet lined with parchment paper.
Bake for 8-10 minutes or until shells are golden brown and firm.
In a mixing bowl, beat the cream cheese until smooth and creamy.
Add in powdered sugar, vanilla extract, and mix until well combined.
Fold in the diced apples, cinnamon, and lemon juice gently.
Fill the cooled taco shells with the apple cheesecake mixture.
Refrigerate for at least 30 minutes to set before serving.
Serve chilled, topped with whipped cream if desired.