Step #3 Stir in 3 1/2 c flour, cocoa, & salt to form a soft dough.
Step #4 Turn dough out onto a lightly floured surface, 1 tbsp at a time, & knead until smooth & elastic (about 10 mins); add enough of the remaining flour, to prevent dough from sticking to hands.
Step #5 Place dough In a large-ish bowl coated with cooking spray, turning to coat top.
Step #6 Cover up & let rise in a warm place (85°), free from drafts, 45 mins or until doubled in bulk.
Step #7 Punch dough down.
Step #8 Turn out onto a lightly floured surface; roll this into a 16 x 8-inch rectangle.
Step #9 Brush egg white over entire surface.
Step #10 Combine 1/4 c sugar & cinnamon; sprinkle evenly over dough.
Step #11 Starting at long side, roll up dough tightly, jelly-roll fashion; pinch seam to seal (do not seal ends of roll).
Step #12 Cut roll this into 16 (1-inch) slices, using string or dental floss.
Step #13 Arrange slices, cut sides up, in a 13 x 9-inch baking pan coated with cooking spray.
Step #14 Cover up & let rise 30 mins or until doubled in bulk.
Step #15 Preheat oven to 350°; bake rolls at 350° for 20 mins.