01 - Preheat the oven to 350°F. Line two baking sheets with parchment paper.
02 - Whisk together the flour, baking soda, and salt in a medium bowl. Set aside.
03 - Beat the softened butter, granulated sugar, and brown sugar together until light and fluffy, about 2-3 minutes.
04 - Beat in the eggs one at a time, mixing well after each addition. Add mint extract, vanilla extract, and green food coloring, mixing until evenly colored.
05 - Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
06 - Fold in the chocolate chips and chopped dark chocolate if using.
07 - Scoop tablespoon-sized balls of dough onto the prepared baking sheets, spacing them about 2 inches apart.
08 - Bake for 9-11 minutes, or until the edges are set and the centers look slightly underbaked.
09 - Cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.