Blueberry Dump Cake 1 (18.5 ounce) package yellow cake mix 4 cups fresh blueberries 1/2 cup white sugar 1/2 cup butter, melted 1 teaspoon ground cinnamon Preheat oven to 350 degrees F (175 degrees C). Mix berries, sugar, and cinnamon in the bottom of a 9 x 13 inch pan. Cover berries with dry cake mix. Pour butter over cake mix, do not stir. Bake for 30 minutes, or until light brown. Serve warm or cold. Top with ice cream if you want.