In a large bowl, combine flour, baking powder and salt; cut in shortening until mixture resembles coarse crumbs. Stir in milk just until moistened. Turn onto a lightly floured surface; knead gently 10-12 times.
Roll into a 15x12-in. rectangle. Spread with butter. Combine the sugar and cinnamon; sprinkle over butter. Roll up jelly-roll style, starting from the short side. Cut into 12 equal slices. Place, cut side down, in a greased 9-in. round baking pan.
Combine topping ingredients; pour over biscuits. Bake at 450° for 20-25 minutes or until lightly browned. Cool in pan 5 minutes; invert onto a platter and serve warm.