You will need:
2 sticks of butter, melted
1/2 a cup of powdered sugar
3 teaspoons of peppermint oil, or 12 teaspoons of peppermint extract. (I only had 7...)
2 teaspoons of vanilla
2 1/4 cups of flour
A few drops of green food coloring (optional)
Combine the melted butter, powdered sugar, peppermint oil, vanilla, and food coloring in a medium sized bowl.
Mix well. Make sure that there aren't any clumps of butter or powdered sugar. Then, stir in 2 1/4 cups of flour. Mix well.
Drop teaspoonfuls of dough onto a greased cookie sheet. Cook at 400 degrees for 8-10 minutes.
Sprinkle with powdered sugar. Enjoy!