Cinnamon Blueberry Crumble Pie

Preheat your oven to the optimal temperature of 375 degrees Fahrenheit (or 190 degrees Celsius, if you prefer metric). This will ensure a perfectly cooked dish.

Create the pie foundation by placing the pastry dough into the bottom and up the sides of a 9-inch round baking dish to form a crust. This will provide a sturdy base for your pie.

In a large mixing container, combine the sugar and flour in a smooth motion. Gradually whisk these two ingredients together until they form a cohesive mixture. Next, add the lemon juice and zest to this blend, then gently fold in the blueberries using a gentle stirring motion. Pour this mixture into your pie crust.

Prepare the topping by combining the oats, brown sugar, flour, and cinnamon in a medium-sized bowl. Utilize two knives or a pastry blender to cut the cold butter into this mixture until it resembles coarse, uneven crumbs. Spread this topping evenly over the pie filling.

Place your pie in the preheated oven and bake until the filling is bubbly and the topping is golden brown, approximately 40 minutes.

Remove your pie from the oven and allow it to cool on a wire rack before serving.