Preheat oven to 350ºF (177ºC) and grease a pie pan with coconut oil.
Spread blueberries in the pie pan. Combine the remaining ingredients in a bowl. Mix with your hands or a spatula and crumble over the blueberries.
Bake for 40 to 45 minutes until golden brown and the blueberries are bubbling. Let cool before serving.
Notes
Oven too hot: Cover with aluminum foil if your topping browns too quickly to prevent burning.
Serve it with: Ice cream, whipped cream, or greek yogurt.
