In a large bowl, combine together the flour, baking soda, cocoa, and salt.
In the bowl of a stand mixer (or a bowl using a hand mixer), cream together the butter and the sugars. Make sure to pull the butter out of the fridge 2 hours before making the cookie dough so that it has time to come to room temperature.
Add in the vanilla and eggs to the creamed butter. Mix well, then mix in the Baileys.
To the wet ingredients, slowly add the dry ingredients mixing after each addition.
Hand mix in the chocolate chips or chocolate chunks.
Place the bowl of dough into the refrigerator for at least 2 hours, up to 24 hours.
Preheat the oven to 350°F and line two baking sheets with parchment paper.
Next, scoop the dough using a cookie dough scoop and place the dough balls onto the baking sheet. Place them about 1 1/2 - 2 inches apart. You can either bake the cookies or freeze them.
Place cookies into the pre-heated oven, one tray at a time. Bake cookies for 9-11 minutes, taking them out as soon as they start turning brown. Make sure you DO NOT over bake them. Let cookies cool on baking sheet for 5 minutes before putting baked cookies on a cooling rack. You can put the baking tray in the freezer for a few minutes to cool it off quickly to bake more cookie dough.