Cream the butter and sugars with a mixer. Add in the eggs one by one, then the vanilla and liqueur.
Slowly add in the flour, baking soda and salt, and mix just until combined.
Fold in the chocolate chips by hand and put in the fridge to chill for 10-30 minutes.
Preheat the oven to 325 degrees F.
On parchment paper or a Silpat, drop a tablespoon of dough evenly spaced on a cookie sheet. These cookies don’t spread too much, which is nice.
Bake for 15 minutes.
If you’re not using multiple cookie sheets at a time to bake, put the unused dough bake in the fridge to keep chilling.
Bake and repeat til the dough is gone. If reusing the same cookie sheet, let it cool slightly on a baking rack between rounds.