Heat oven to 375 degrees F. Generously grease an 8 or 9" square (2 qt) baking dish.

 

In small bowl, combine brown sugar and cinnamon; mix well with fork. Separate dough into 10 biscuits. Cut each biscuit into quarters. Dip each piece in melted butter; coat with brown sugar mixture. Arrange in single layer in greased baking dish. Sprinkle with 1/2 cup of the oats.

 

In medium bowl, combine blueberries and sugar; toss to coat. Spoon over oats and biscuits; sprinkle with remaining 1/2 cup oats. Top with butter pieces. Bake at 375 degrees F for 30 to 35 minutes or until coffee cake is golden brown and center is done.

 

Cool 20 minutes. Serve warm.