Here is a recipe for a blueberry crumble that will be prepared and out of the oven in 40 minutes, that’s not counting the time passed in the garden picking the blueberries.
1 cup zweiback crumbs
1/4 cup sugar
1/4 teaspoon cinnamon
3 tablespoons melted butter or margarine
2 cups fresh blueberries
Combine the crumbs, sugar and cinnamon and then cut in the butter.
Place 1 cup blueberries in a greased 8x8x2-inch pan; cover with half the crumb mix; add the remaining blueberries and top with the remaining crumbs. Press down firmly with a spatula or spoon until the mix is only 3/4 inch thick.
Bake in a moderate oven, 350F for 30 minutes. Cool and cut into squares.
Recipe by Harvest to Table at https://harvesttotable.com/blueberryzweiback_crumble/