Spread the blueberry pie filling into the bottom of a 9”x13” baking dish.
Sprinkle the cake mix evenly over the pie filling layer.
Slice very thin pats of butter and spread over the entire top of the dry cake mix. Cover as much of the cake mix as possible. Hint: cold butter is much easier to work with than softer butter.
Top with fresh blueberries.
Bake for 30 minutes or until the topping is browned and the blueberry filling is bubbling around the edges. If needed during the last few minutes of baking, add additional butter to any areas where there is dry cake mix and bake a bit longer.
Allow dump cake to rest for 15 minutes before serving.
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Notes
Storage:Store, covered, in the refrigerator for up to 7 days or freeze for up to 1 month. Thaw in the refrigerator or reheat to serve.Notes:Allowing the dump cake to rest for a bit before serving it will give the blueberry filling time to cool just a bit so that it is not super runny when you scoop into it.Serve with vanilla ice cream.You can add frozen or fresh berries (we used about 1.5 cups) to the top of the cake before baking. They add a little tartness to balance out the sweet canned filling. If desired you can also leave them out. Some like to toss the berries in sugar, but we like the variation in flavors.For a tangy finish, add lemon zest or a little lemon juice over top of the blueberry mixture.Near the end of the baking time, if there are dry spots on top, pour a little melted butter over them and bake a few more minutes.