Preheat your oven to 375°.

In a shallow 8-inch baking dish, spread the blueberry pie filling equally; set aside.

In medium bowl, combine flour, brown sugar, oats and cinnamon. Stir in Hellmann's® or Best Foods® Real Mayonnaise.

Using your fingers (I use gloves because it can get a bit messy), gently pinch the dough to form crumbs. Evenly sprinkle crumbs over pie filling.

Bake 30 minutes or until topping is golden.