Preheat oven to 350 degrees.
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 a heaping 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 pecans or walnuts (if desired) into a 10-in fluted tube pan coated with cooking spray. Layer in order with half of the biscuits, 1/2 brown sugar and butter mixture and 1/2 cup walnuts or pecans. Repeat layers.
Bake at 350° for 40-45 minutes or until golden brown. Immediately invert onto a serving platter. Serve warm. Refrigerate leftovers. Yield: 1 loaf (12 servings).