Preheat your oven to 350°F (175°C) and line your baking sheets with parchment paper.
In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar using an electric mixer or whisk until the mixture is light and fluffy.
Add the eggs, Baileys Irish Cream, and vanilla extract to the butter mixture. Mix until well combined.
In a separate bowl, whisk together the all-purpose flour, baking soda, and salt.
Gradually add the dry ingredients to the wet mixture, mixing until just combined. Do not overmix.
Fold in the semi-sweet chocolate chips until evenly distributed throughout the cookie dough.
Using a cookie scoop or spoon, drop rounded tablespoons of the cookie dough onto the prepared baking sheets, leaving about 2 inches of space between each cookie.
Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden and the centers look set.
Remove from the oven and allow the cookies to cool on the baking sheets for about 5 minutes before transferring them to a cooling rack to cool completely.