In a large mixing bowl, beat the butter with an electric mixer on medium-high speed for 30 seconds.
Add the brown sugar, baking powder, lemon peel, cinnamon, all spice, and salt and beat till combined.
Beat in the egg yolks and vanilla.
Beat in any remaining flour and ground walnuts with a wooden spoon.
Divide dough in half. Cover and chill for 1 hour or till dough is easy to handle.
. On a lightly floured surface, roll each half of dough to a 1/8” thickness. Using a cookie cutter, cut out dough. Place 1” apart on ungreased baking sheets. Using a small cutter, cut out the centers of half the unbaked cookies. Remove the centers and reroll dough.
Bake cookies in a preheated 375* oven for 7-9 minutes, or until edges are firm and bottoms are browned. Remove cookies with a spatula and cool on a rack.
To assemble cookie sandwiches sift confectioners’ sugar over the tops of the cookies with cutouts in center. Set aside. Spread about ½ tsp. of the jam onto the bottom of each cookie without the cutout; top with a cutout cookie, confectioners’ sugar side up.