Preheat oven to 350 degrees. In a large mixing bowl, cream butter and sugar for 4 minutes until light and fluffy and pale in color. Add egg and vanilla. Add molasses and mix well.
Add flour, baking soda, baking powder, salt, cinnamon, ginger, cloves, and cayenne pepper. Mix just until combined to avoid over-mixing the dough. Fold in chocolate chunks.
Place sugar into a small bowl. Roll dough into small balls and roll into sugar, coating well. If you want the cookies to look like the ones in this recipe, place a few dark chocolate chunks on the top of the cookie before baking.
Place on a parchment paper-lined baking sheet and bake for 10-13 minutes.