Since I'm such a mint lover, these are one of my favorite cookies. I just got the recipe from the back of a bag of Andes baking pieces. I've been making these for a few years.
Here is a link to the official site's recipe.
Andes Creme de Menthe Cookies
1/2 cup salted butter - softened
3/4 cup dark brown sugar
1/2 cup white granulated sugar
1 tsp. baking soda
1 tsp. baking powder
2 tsp. vanilla extract
1 package (10 oz.) Andes® Crème de Menthe Baking Chips
2-2/3 cups sifted all-purpose flour
Preheat oven to 350° F.
Blend butter, sugars, baking soda, baking powder, vanilla and eggs until mixed.
Stir in Andes Baking Chips and then flour. Chill approximately one hour in the refrigerator.
Measure out approximately 1 oz. of dough. Form a ball and slightly flatten.
Raise oven rack one level above the middle and bake on non-stick baking pans.
Bake at 350° F for approximately 8 - 10 minutes.
Cool on pans for two minutes before removing.
4 dozen cookies.