Summer blueberries, sugar, salt, lemon juice, and a thickener like corn starch or flour. Top that yum with a separate mix of rolled oats, all purpose flour, salt, and baking powder plus a mix of butter and sugar. Bake at 375F until it’s bubbling in the center.
The measurements are included in this demonstration by Sarah Carey and Everyday Food: Simple Blueberry Crumble. Don’t have blueberries? Try it with raspberries, peaches, or almost any other fruit.
Bonus: See how blueberries grow.