Lightly grease 2 baking sheets, set aside. In a large bowl cream margarine and brown sugar until fluffy. Beat in espresso powder, vanilla and eggs one at a time. In a separate bowl, combine flour and baking powder; stir into butter mixture. Stir in chips. Drop by slightly rounded tablespoonful about 2" apart onto cookie sheets. Bake at 350 degrees for 12 mins. Or until cookies are done. Do not overbake. Remove from oven and let cool on the baking sheet for 1 min. Remove to rack and finish cooling.
