1. Preheat oven to 350 degrees F. Line 28 muffin tins with paper liners.
2. Sift together both flours, baking powder, salt and cinnamon.
3. In a large mixing bowl, cream together butter and sugar until pale and fluffy. Add eggs, one at a time, beating until each is incorporated, scraping down sides of bowl as needed. Beat in vanilla. Add the flour mixture in three parts, alternating with additions of milk, beating until combined after each addition.
4. Divide batter evenly among lined cups, filling each about 3/4 full. Bake about 20 minutes, or until toothpick inserted into the center of one of the cupcakes comes out clean. Remove to a wire rack to cool completely before icing.
5. Prepare frosting: In a medium bowl, use electric mixer to blend cream cheese and butter. Add sugars, vanilla and ground cinnamon. Spread onto cooled cupcakes, or scoop into piping bag and pipe on the frosting decoratively. Place sugar-cinnamon mixture in a fine sieve and tap it lightly over the cupcakes to give them a light sprinkle.
