01 -
Whisk the flour, baking soda, salt, cinnamon, and espresso powder in a medium bowl until evenly combined.
02 -
Beat the softened butter, brown sugar, and granulated sugar in a large bowl for about 2 minutes, until smooth and slightly lighter in color.
03 -
Beat in the egg, egg yolk, vanilla, and Bailey's Irish Cream. Scrape the bowl and mix again just until creamy.
04 -
Add the dry ingredients on low speed and mix just until no dry flour remains. Fold in the chocolate chips with a spatula.
05 -
Cover and chill the dough for at least 1 hour, or up to 24 hours, until firm enough to scoop cleanly.
06 -
Heat the oven to 350°F (175°C). Scoop 2-tablespoon portions onto parchment-lined baking sheets, spacing them 2 inches apart. Bake for 10-12 minutes, until the edges are set and the centers still look soft.
07 -
Let the cookies cool on the baking sheet for 8-10 minutes, then transfer to a wire rack. Press a few extra chocolate chips on top while warm if desired.