Blueberry Crumb Pie

Preheat the oven to 375 degrees F (190 degrees C).

Make the pie: Press pie pastry into the bottom and up the sides of a 9-inch pie plate to form a crust.

Whisk sugar and flour together in a large bowl. Mix in lemon juice and zest, then gently stir in blueberries. Pour mixture into crust.

Make the topping: Combine oats, brown sugar, flour, and cinnamon in a medium bowl. Cut in cold butter with two knives or a pastry blender until the mixture resembles coarse crumbs. Spread topping evenly over pie filling.

Bake in the preheated oven until filling is bubbly and topping is golden brown, about 40 minutes.

Remove from the oven and cool on a wire rack before serving.