Combine the blueberries, cornstarch, and lemon juice in a microwave safe bowl. Microwave for 1 minute.
In a separate bowl, combine the topping ingredients. Add the water last, just a few drops at a time until the consistency is crumbly. You can use more if needed.
Remove the blueberry bowl from the microwave and spread the crumble evenly on top. Microwave together for 1 more minute.
Top with some greek yogurt, whipped cream, or even some icecream. Enjoy!
