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Step 1
Preheat the oven to 350 degrees F (175 degrees C).
Step 2
Place the blueberries into an 8 inch square baking dish. In a medium bowl, stir together the flour, sugar, and cinnamon. Stir in the mayonnaise until the mixture resembles coarse crumbs. Sprinkle over the top of the berries.
Step 3
Bake for 35 to 40 minutes in the preheated oven, until the top is lightly browned.