Add the melted butter, brown sugar, and molasses to a large bowl. Stir until combined. Add in the egg yoke and mix.
Add in the remaining ingredients and mix until a shaggy dough forms.
Turn the dough out onto a lightly dusted surface and knead.
Roll the dough out to ¼ inch thickness and then use cookie stamps to imprint your desired design. Use cookie or biscuit cutters to finish cutting out the cookies.
Transfer the cut cookies to a lined baking tray and freeze for 10 minutes.
Bake the cookies on a lined baking sheet for 9-10 minutes.
While the cookies cool make the glaze by adding the powdered sugar and 1 tablespoon of bourbon and stir until combined. Add the vanilla and stir again. If the mixture is still thick and not a brushable consistency, add more bourbon for a little bit of time until the right consistency is reached.
Brush the glaze on top of the cookies and let set.
Notes
Store baked cookies in an airtight container at room temperature for 2-3 days. You can also refrigerate or freeze the cookie dough; just be sure to bring them to room temperature before baking.
*Measure your flour properly. This is my best baking tip! I typically fluff my flour, then scoop and level.
If your cookie stamps stick to the dough, add a bit of flour to the dough before stamping.