In a medium bowl, whisk together the 1 1/2 cups all-purpose flour, 2 Tbsp dark cocoa powder, 1 tsp baking soda, 1/4 tsp salt, 1 tsp cinnamon, 1/4 tsp chili powder, and 1/4 tsp cayenne pepper. Add to the mixing bowl 1/2 at a time. Mix until the dough just begins to come together.