Preheat oven to 350 degrees. Grease an 11 x 15 jelly roll pan.
Using a mixer, beat together the shortening and brown sugar until creamy and light.
Next, add the vanilla and the eggs, one at a time, and beat.
In another bowl, combine the dry ingredients - the flour, baking powder and salt. Stir to combine. Then, with mixer on low, add the flour mixture by spoonfuls, occasionally turning up the speed until flour is incorporated.
Last, add the chocolate chips and nuts, stirring to incorporate into the cookie dough.
Spread this mixture into your prepared pan using a spatula.
Bake for about 20 minutes. Don't over bake! When done, cool a bit. Cut into bars while still warm.