In a small microwave-safe bowl, heat brown sugar and butter on high for 1 minute or until sugar is dissolved; set aside. , Flatten each biscuit into a 3-in. circle. Combine sugar and cinnamon; sprinkle 1/2 teaspoon in the center of each biscuit. Top with a cream cheese cube. Fold dough over filling; pinch edges to seal tightly., Sprinkle 1/2 cup walnuts into a 10-in. fluted tube pan coated with cooking spray. Layer with half of the biscuits, cinnamon-sugar and butter mixture and 1/2 cup walnuts. Repeat layers., Bake at 350degrees for 40-45 minutes or until golden brown. Immediately invert onto a serving platter. Serve warm. Refrigerate leftovers.