01 - Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 - In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
03 - In a large bowl, beat softened butter, granulated sugar, and brown sugar until light and creamy, about 2 minutes.
04 - Add eggs one at a time, beating well after each addition. Mix in mint extract, vanilla extract, and green food coloring until evenly combined.
05 - Gradually add the dry ingredients to the wet mixture, mixing just until incorporated.
06 - Fold in semi-sweet chocolate chips and mint chocolate chips, if using.
07 - Scoop heaping tablespoons of dough onto prepared baking sheets, spacing cookies about 2 inches apart.
08 - Bake for 9-11 minutes, until edges are set but centers are still soft.
09 - Allow cookies to cool on baking sheet for 5 minutes, then transfer to wire rack to cool completely.