Preheat the oven to 350°F. In the bowl of a stand mixer, cream together the butter, brown sugar, vanilla extract, and egg until smooth and fluffy.
In a separate bowl, whisk together the flour, graham flour, graham cracker crumbs, baking soda, and a pinch of salt.
With the mixer on low speed, slowly pour in the molasses and beat until fluffy. Gradually add the dry mixture, about 1/2 cup at a time, until fully combined.
Continue to mix the dough on low until a smooth dough forms—it shouldn't stick to the sides of the mixing bowl. Tip the dough out onto a floured surface, knead a few times, then roll it into a ball. Chill in the refrigerator for about ten minutes.
Pull off 2-3 tablespoon-sized chunks of dough. Roll into a snake-like shape, about 6-8 inches long. Form each snake into a triangle shape and place on a baking sheet. Repeat with the remaining dough, and create a single strip down the center of each triangle to complete the Deathly Hallows symbol.
Bake for 10-15 minutes, until golden brown and puffed slightly. Remove from the oven and let cool on a rack. Dust with powdered sugar if desired. Serve in celebration of You-Know-Who being defeated. Enjoy!