Pillsbury Grands "Monkey Bread"

I got this from the Pillsbury website...

½ c. sugar

1 t. cinnamon

2 cans (16.3 oz each) Pillsbury Grands!® Homestyle refrigerated buttermilk biscuits
½ c. chopped walnuts, if desired
½ c. raisins, if desired
1 c. firmly packed brown sugar

¾ c. butter or margarine, melted

1. Heat oven to 350°F. Lightly grease 12-cup fluted tube pan.
2. In large plastic food-storage bag, mix sugar and cinnamon. Separate dough into 16 biscuits; cut each into quarters. Shake in bag to coat. Arrange in pan, adding walnuts and raisins among the biscuit pieces.
3. Mix brown sugar and butter; pour over biscuit pieces.
4. Bake 28 to 32 minutes or until golden brown and no longer doughy in center. Cool in pan 10 minutes. Turn upside down onto serving plate; pull apart to serve. Serve warm.