Preheat oven to 350 F. Lightly grease 8” square pan.

Pour berries into pan.

Combine flour, sugar, and cinnamon in a medium bowl. Stir in mayonnaise and vanilla. Texture should resemble course crumbs. Sprinkle over the top of blueberries.

Bake in oven until lightly browned, 35-45 minutes.

Allow to cool slightly and serve with vanilla ice cream on top.