Creating your Blueberry Crumble Cheesecake Pie is straightforward. Follow these steps for a successful outcome:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).

2. Make the Crust:
– In a medium bowl, combine graham cracker crumbs, melted butter, and sugar. Mix until well combined.
– Press this mixture evenly into the bottom of a 9-inch pie dish.
– Pre-bake the crust for 10 minutes. Remove from oven and let it cool slightly.

3. Prepare the Blueberry Filling:
– In a saucepan over medium heat, combine blueberries, sugar, cornstarch, and lemon juice.
– Cook until the mixture thickens and becomes bubbly, about 5-7 minutes. Remove from heat and let cool.

4. Make the Cheesecake Filling:
– In a large bowl, beat the softened cream cheese until smooth.
– Gradually add the sugar, and beat until well combined.
– Add eggs, one at a time, mixing well after each addition.
– Stir in vanilla extract and lemon juice.

5. Assemble the Pie:
– Pour the cheesecake filling into the pre-baked crust.
– Spoon the blueberry filling evenly over the cheesecake layer.

6. Prepare the Crumble Topping:
– In a medium bowl, combine oats, flour, brown sugar, and cinnamon.
– Drizzle in the melted butter and mix until crumbly.
– Sprinkle the crumble mixture evenly over the blueberry filling.

7. Bake the Pie:
– Bake in the preheated oven for 45-50 minutes, or until the edges are set but the center still jiggles slightly.
– The crumble topping should be golden brown.

8. Cool the Pie:
– Allow the pie to cool to room temperature before refrigerating for at least 2 hours.