Preheat oven to 400°.
Lightly spoon flours into dry measuring cups; level with a knife. Combine both flours and the next 5 ingredients (through salt) in a large bowl; stir well with a whisk.
Combine sour cream, butter, and egg white in a small bowl. Add sour cream mixture to flour mixture, stirring just until moist. Stir in currants.
Turn dough out onto a lightly floured surface; knead lightly 6 to 12 times with floured hands. (Dough will be crumbly.) Divide dough in half. Pat each half into a 6-inch circle on a baking sheet coated with cooking spray. Cut each circle into 6 wedges; do not separate.
Combine 1 tablespoon granulated sugar and cinnamon. Lightly coat top of dough with cooking spray. Sprinkle with cinnamon mixture. Bake at 400° for 15 minutes or until lightly browned.