01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together flour, baking soda, and salt in a medium bowl. Set aside.
03 - Beat softened butter, granulated sugar, and brown sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
04 - Add eggs one at a time, mixing thoroughly after each addition. Blend in mint extract, vanilla extract, and green food coloring until evenly distributed.
05 - Gradually mix in dry ingredients just until combined. Avoid overmixing.
06 - Gently fold in chocolate chips and chopped dark chocolate if using.
07 - Drop tablespoons of dough onto prepared baking sheets, spacing 2 inches apart.
08 - Bake for 9-11 minutes until edges are set and centers remain soft.
09 - Allow cookies to rest on baking sheet for 5 minutes, then transfer to wire rack to cool completely.