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, about 2-3 minutes.
04 - Beat in eggs one at a time. Add peppermint and vanilla extracts, mixing well.
05 - Gradually incorporate green food coloring until desired vibrant shade is achieved.
06 - Mix in dry ingredients on low speed until just combined. Do not overmix.
07 - Gently fold in chocolate chips and optional chopped mint chocolate pieces.
08 - Scoop rounded tablespoons of dough onto prepared baking sheets, spacing 2 inches apart.
09 - Bake for 9-11 minutes until edges are set but centers remain slightly soft.
10 - Let cookies rest on baking sheet for 5 minutes before transferring to wire rack to cool completely.