Preheat oven to 315F (155C) and line baking sheets with parchment paper. Set aside.
In a large bowl, combine melted, cooled butter, sugars, vanilla extract, and spices (ginger, cinnamon, cloves, cayenne pepper, and black pepper). Stir well.
Add molasses, egg yolk, and milk and stir until completely combined.
In a separate bowl, whisk together flour, baking soda, and salt.
Gradually stir dry ingredients into wet until completely combined.
Scoop cookie dough into 2-teaspoon-sized portions. Roll between your palms until smooth and then roll through granulated sugar.
Transfer to prepared baking sheet, spacing cookies 2” apart.
Transfer to 315F (155C) oven and bake for 22 minutes.
Within a minute or two of cookies coming out of the oven, use the clean, flat, bottom of a glass to firmly press down on cookies to flatten.
Allow cookies to cool completely on baking sheet before enjoying. Once cooled they should be crisp and snappy (if the first batch isn’t crisp once cooled, bake subsequent batches for longer).