Preheat oven to 350ºF (180ºC). Butter baking sheets or line them with parchment paper.
Beat ½ cup unsalted butter with ½ cup white sugar and ½ cup light brown sugar in a large bowl until creamy. You can use the stand mixer or a hand-held beater.
Add 1 egg, 1 teaspoons vanilla extract and ¼ teaspoon peppermint extract and mix well.
Add the sifted dry ingredients (1 ½ cups all-purpose flour, ½ teaspoon baking soda, pinch of baking powder and ¼ teaspoon salt) and mix until a few dry spots remain. Don’t overbeat at this point.
Add 1 cup semisweet chocolate chips and ½ cup mint chips and mix until no dry spots remain. I like to switch to a spatula for this part.
Scoop portions of cookie dough and place them on the prepared sheets, spacing them two inches or so apart.
Bake for about 10 minutes, until edges are firm and cookies are golden but still soft in the center. It might take a minute or two more if your cookies are larger.
Let cool completely on a cooling rack.
Keep in tins or cookie jars.
Bake for about 10 minutes, until cookies are soft in the center with firm, golden edges. It might take a minute or two more if your cookies are larger.
Let cool completely on a cooling rack.
Keep these chewy cookies in tins, cookie jars or an airtight container.