Using a stand mixer, cream butter and sugar together until light and fluffy. Beat in eggs and vanilla extract.

In a medium bowl, stir together flour, baking powder and salt. Gradually add into creamed mixture.

Drop from tsp measurement onto lined cookie sheet. Press center of cookie with floured index finger and fill indentation with piped mint jelly.

Bake at 350 degrees F for 8-10 mins, or until lightly browned. Allow to cool on tray for a few mins before transferring to wire rack to cool completely.