Brown Sugar Crackles

Preheat oven to 350 degrees F. Coat 3 baking sheets with cooking spray.

Stir together all-purpose and whole-wheat flours, baking powder, baking soda and salt in a small bowl. Beat together brown sugar, butter, oil, eggs and vanilla in a mixing bowl with an electric mixer on high speed until smooth, making sure no lumps of brown sugar remain, about 1 minute. Stir in the dry ingredients until completely blended. (The dough will be stiff.)

Divide the dough in half and press each half into a flat disk. Roll out one of the disks on a lightly floured surface to a 1/4-inch thickness. Cut out cookies with a 2-inch round cookie cutter, placing the cookies 1 inch apart on the prepared baking sheets. Repeat with the remaining dough. Press the scraps together and cut out additional cookies. Bake the cookies, one sheet at a time, until they are puffed in the middle and browned around the edges, 8 to 10 minutes. Let stand for about 2 minutes on the baking sheets, then remove to a wire rack to cool completely.