Pre-heat oven to 350℉.
In a medium sauce pan, melt butter over medium heat. Add in the fresh mint, and cook for 2-3 minutes until the butter becomes fragrant. Remove from heat and strain the butter, pressing the mint leaves firmly to press out any remaining mint juices. Set aside to cool for a few minutes.
Combine flour, baking powder, and salt in a small bowl.
In a large mixing bowl, cream together the melted butter, granulated sugar, light brown sugar, egg, and vanilla until smooth.
Gradually add in flour mixture a little at a time and mix until well incorporated.
Fold in chocolate chips until evenly distributed.
Chill cookie dough in the refrigerator for at least 30 minutes.
Scoop cookie dough into 1 inch balls. Place onto your prepared cookie sheet, spacing 2-3 inches apart. Bake at 350℉ for 10 minutes.