Cream butter and shortening until soft

Add sugar gradually and continue to cream for approx 5 minutes until light and fluffy

Add egg and vanilla; beat well

Mix flour, baking powder and salt together, slowly add to mixture; mix well after each addition, dough will be stiff

Shape dough into 2 rolls, wrap in wax paper and refrigerate for 1 hour

Fill gun and make cookies, decorate as desired

Bake at 375° for approx 7-8 minutes or until just starting to turn light golden around the edges. Do not overbake