In a medium bowl, whisk to thoroughly combine the egg, brown sugar, molasses, almond butter, melted butter, and applesauce.
To the wet ingredients, stir in the ground ginger, cinnamon, allspice, kosher salt, baking soda, all-purpose flour, and whole wheat flour until well combined. Form the dough into a ball, cover with plastic wrap, and chill at least 1 hour or overnight.
Preheat the oven to 350°F.
Dust a flat surface with flour, then flour the rolling pin and roll out the dough to ¼-inch thick. Use a cookie cutter to cut out narwhals, about 20 total. Place the narwhals on a parchment paper-lined baking sheet. If using edible glitter, add gently press the glitter onto the narwhal tusks.
Bake the cookies about 8 minutes, until puffed and slightly firmed. Let rest on the pan for 2 to 3 minutes, then transfer to a cooling rack.
Once cooled, sprinkle with powdered sugar using a sifter or sieve, covering the tusks with parchment paper. Store covered at room temperature for several days or freeze for several months.