Making Blueberry Crumble is straightforward when you follow these simple steps:

1. Preheat Your Oven: Set your oven to 350°F (175°C) and grease a baking dish with butter or cooking spray.
2. Prepare the Blueberries: In a large bowl, combine the fresh blueberries, granulated sugar, lemon juice, vanilla extract, and cornstarch. Mix gently to avoid breaking the berries.
3. Combine Dry Ingredients: In another bowl, mix together the flour, rolled oats, brown sugar, cinnamon, and salt until well combined.
4. Add Butter: Pour the melted butter into the dry ingredients and mix until crumbly. The mixture should resemble coarse crumbs.
5. Layer the Blueberries: Spoon the blueberry mixture into the prepared baking dish, spreading it evenly.
6. Top with Crumble: Evenly distribute the crumble mixture over the blueberries, ensuring it covers them completely.
7. Bake: Place in the preheated oven and bake for 40-45 minutes or until the top is golden brown and the blueberries are bubbling.
8. Cool: Remove from the oven and allow to cool for at least 15-20 minutes before serving. This helps the juices set.
9. Serve: Enjoy warm, either plain or with a scoop of your favorite ice cream or whipped cream.

By following these steps, you’ll be on your way to creating an incredible Blueberry Crumble that will delight everyone.