In saucepan, heat chips on low heat until melted and smooth.
In a large bowl with mixer, beat melted chocolate, flour, butter, corn syrup, baking soda, salt, egg and ½ cup sugar until blended. Increase speed to medium and beat until well-mixed, scraping bowl with rubber spatula. Wrap dough with plastic wrap and refrigerate until easy to handle (about 2 hours).
Preheat the oven to 350 degrees. Place some sugar in a small bowl. Shape dough into 48 balls. Roll balls in sugar and bake on cookie sheet 12 to 15 minutes.
Immediately remove ½ of cookies from cookie sheet onto work surface. Top each cookie with 2 mints and place the other half of the cookies on top. If your freezer is big enough, place in freezer until set, or leave at room temperature until set.
Notes
These taste divine while still warm, and they are a great frozen treat, as well.
Andes brand mints can be found in the candy section of most stores.