2 tablespoons butter or margarine, cut into small pieces
Heat oven to 375°F. Generously spray a 9x13 inch pan. Separate dough into 10 biscuits; cut each into quarters, then cut each quarter in half again. I like my biscuit pieces smaller, because they puff up when baking. Arrange in single layer in baking dish.
In small bowl, melt 1/4 cup butter, combine melted butter with brown sugar and cinnamon. Pour over biscuits. Sprinkle with 1/2 cup of oats.
In medium bowl, toss blueberries and granulated sugar to coat. Spoon over oats and biscuits. Sprinkle with remaining 1/2 cup oats; top with butter pieces.
Bake approx. 25-30 minutes or until coffee cake is golden brown and center is done. Serve warm.