In a large bowl combine flour, granulated sugar, baking powder, and salt. Using a pastry blender, cut in 1/2 cup cold butter until the mixture resembles coarse crumbs. Make a well in center of flour mixture.

In a medium bowl combine KELLOGG'S ALL-BRAN ORIGINAL cereal with milk; let stand 6 minutes or until cereal softens. Stir into flour mixture until dough just forms a ball. On a lightly floured surface, knead dough gently 10 to 12 strokes. Roll or pat dough on lightly floured surface into a 14x10-inch rectangle. Combine brown sugar and cinnamon. Spread dough with 1/2 cup softened butter; sprinkle with cinnamon mixture. Roll up in a spiral, starting from the long side. Pinch seam to seal. With a knife, cut into 12 thick slices. Arrange slices, cut sides down, in a 13x9x2-inch baking pan coated with cooking spray.

Bake at 400 degrees F 24 to 26 minutes or until lightly browned. Remove biscuits from pan. Cool slightly on wire rack. Drizzle with caramel topping.