1 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.
Mix berries, sugar, and cinnamon in the bottom of a 9 x 13 inch pan.
Cover berries with dry cake mix.
Place cut butter pieces over cake mix, do not stir.
Bake for 30 minutes, or until light brown.
Serve warm or cold.