Preheat oven to 375 degrees F. Lightly grease and flour a 13- x 9-inch baking pan.
In a medium bowl, sift together the flour, baking soda, salt, cinnamon, cloves, and allspice together; set aside.
In a large bowl, combine egg, butter, brown sugar, and molasses; beat together until mixture is thick and smooth. Add orange zest, orange extract, and vanilla extract; stir to mix. Add mincemeat, raisins and nuts; stir to mix. Add flour mixture; stir until mixed.
Spread the batter evenly in the baking pan. Bake approximately 25 to 30 minutes or until a toothpick inserted in the center comes out clean. Remove from oven.
Using a fine-mesh sieve, dust the top of the hot cookie with confectioners sugar. Leave cookie in pan to cool; place baking pan on wire rack to cool.
When cool, cut into 2-inch squares.
Mincemeat Bars Cookie Recipe: https://whatscookingamerica.net/cookie/mincemeatbars.htm