"Blueberry Dump Cake is one of the easiest fruity desserts you've ever had. Dump all your ingredients in and bake! So easy and delicious too!..."
INGREDIENTS
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2 cups frozen blueberries (thawed)
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2 Tablespoons packed brown sugar ((optional, see notes))
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21 ounce can blueberry pie filling
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1 teaspoon vanilla extract ((optional, see notes below))
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15.25 ounce box white cake mix ((I used Duncan Hines))
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½ cup (1 stick) salted butter, cut into 20 slices.