Step 1 – Prepare the Oven (Preheat oven to 375°F (190°C)
Place a baking sheet on the lower rack to catch any drips.
Step 2 – Make the Filling
In a large bowl, combine:
Blueberries
Granulated sugar
Brown sugar
Cornstarch
Lemon juice
Lemon zest
Vanilla extract
Cinnamon
Salt
Toss gently until blueberries are evenly coated.
Step 3 – Prepare the Pie
Fit the pie crust into a 9-inch pie dish.
Pour the blueberry filling into the crust.
Spread evenly.
Step 4 – Make the Crumble
In a medium bowl, mix:
Flour
Oats
Brown sugar
Cinnamon
Salt
Cut in cold butter using a pastry cutter or fork until coarse crumbs form.
Sprinkle crumble evenly over the blueberry filling.
Step 5 – Bake
Bake for 20 minutes at 375°F (190°C).
Reduce oven temperature to 350°F (175°C).
Continue baking for 30–35 minutes, or until:
Filling is bubbling,
Topping is golden brown.
If crust edges brown too quickly, cover them with foil.
Step 6 – Cool
Remove pie from oven.
Allow to cool for at least 2 hours before slicing so the filling sets properly.
Step 7 – Serve
Slice into 8 portions.
Serve warm or at room temperature.
Top with a scoop of vanilla ice cream for the ultimate dessert experience.