In a mixing bowl, cream together the margarine and sugar. Add the flour and blend. Add the chocolate chips and blend. The dough will be crumbly, not wet.
Press the dough evenly into the pan.
Bake for 20 minutes or until the edges are a light golden brown.
Let cool for one minute, then cut the cookies while they are still warm.
Leave them in the pan until completely cool, then remove to an airtight container--or to gift bags!