Whole-Wheat–Raspberry Bars

Preparation

1. Step 1

   Whisk together the flours, bran, salt, and baking soda in a medium bowl; set aside. Put the brown sugar and zest in the bowl of an electric mixer fitted with the paddle attachment; mix on medium speed until combined. Beat in the butter until fluffy. Beat in the egg until pale and smooth.

   Step 2

   Reduce speed to low. Mix in the flour mixture in 3 batches, alternating with the applesauce. Divide the dough in half; wrap in plastic. Chill until firm, about 2 hours.

   Step 3

   Preheat the oven to 375°F. Roll out 1 piece of dough between 2 lightly floured sheets of parchment to a 9 1/2 × 11 1/2-inch rectangle, about 1/8 inch thick. If the dough becomes too soft, refrigerate until firm. Remove the top piece of parchment. Trim the dough 1/2 inch on all sides. Transfer the rectangle on the parchment to a baking sheet.

   Step 4

   Cut the rectangle in half lengthwise. Spread 1/4 cup jam down half of each length, leaving a 1/2-inch border. Fold the dough over; pinch to seal. Refrigerate until firm, about 20 minutes. Repeat with the remaining chilled dough and jam.

   Step 5

   Cut crosswise into 1 1/2-inch-wide bars, but do not separate them until after baking. Bake until golden brown, about 20 minutes. Let cool on the sheet on a wire rack. The bars can be stored in an airtight container at room temperature for up to 3 days.