In a medium bowl, add all of the dry ingredients. Whisk together until fully incorporated. Set aside.
Place the butter, date sugar, egg and maple syrup in a large bowl. Beat with an electric mixer on medium until creamy. With mixer on low, gradually add the flour mixture. Then beat on low until it resembles small to medium crumbs.
Pour half of the crumbs onto a piece of wax paper. Repeat with remaining crumbs. Press and squeeze the crumbs into a ball of dough, then flatten slightly with the palm of your hand. Place a second piece of wax paper on top of each. Roll out into a rectangle that measures about 7" x 10".
Remove the top pieces of wax paper, then add the filling. Use half of the filling for each rectangle of dough. Spread it right down the middle of the rectangle, lengthwise. The filling section should be about 2 inches wide and 10 inches long.
Use the wax paper to gently fold the dough over the filling on each side. Very gently press at seams, so the dough will stick together.
Gently transfer the two cookie logs to your prepared sheet pan. Use a pizza cutter or sharp knife to cut the dough into 1-inch cookies. Gently separate cookies so there is about an inch in between each one. You should have about 7 or 8 cookies per log.
Bake for 12-15 minutes or until light golden brown on the edges. Let cool and serve. Store in an airtight container at room temperature for 2 days or in the refrigerator for 2 weeks.