How to Make It
Preheat oven to 375°.
Weigh or lightly spoon flours and cornstarch into dry measuring cups; level with a knife. Combine flours, cornstarch, baking soda, and next 7 ingredients (through allspice) in a medium bowl; stir with a whisk.
Place butter, brown sugar, and 1/4 cup granulated sugar in a large bowl; beat with a mixer at low speed 1 to 2 minutes; increase speed to medium, and beat until well blended. Add molasses and egg; beat well. Gradually add flour mixture, beating until well blended.
Lightly coat hands with cooking spray; shape dough into 60 (1-inch) balls. Place 2 inches apart on baking sheets lined with parchment paper. Flatten cookies with the bottom of a glass. Sprinkle cookies with 1 teaspoon granulated sugar. Bake at 375° for 10 minutes or until golden brown. Cool 2 minutes on pans. Remove cookies from pans; cool on wire racks.