Preheat oven to 350°F (175°C).

In a large bowl, cream together the softened butter and sugar until light and fluffy.

Beat in the egg, vanilla extract, and peppermint extract.

In another bowl, whisk together the flour, salt, and baking powder. Gradually add the dry ingredients to the wet ingredients and mix until just combined.

If desired, add a few drops of green food coloring and mix well.

Scoop tablespoons of dough and roll them into balls. Place them on a baking sheet lined with parchment paper.

Bake for 10-12 minutes or until the edges are lightly golden.

Remove from the oven and immediately press a Hershey's Kiss into the center of each cookie.

Let cool on a wire rack.