1. Preheat oven to 425°F. Place baking sheet in oven while preheating.
2. Toss blueberries with sugar, lemon juice, cornstarch and vanilla to coat. Spoon blueberry mixture into pie crust; place on heated baking sheet.
3. Bake 20 minutes; sprinkle granola evenly over pie. Bake an additional 20 minutes or until pie is bubbly.
Cook's Tip
If pie is allowed to stand 4 hours or overnight, the flavors will blend, making a sweeter-tasting dessert. This is true with most fruit pies, especially blueberry, cherry and peach pies.