My family has enjoyed these bars as a potluck dessert, brown-bag treat and anytime snack many times throughout the years. Butterscotch or peanut butter chips can be used in place of the chocolate chips.
In a large bowl, cream shortening and brown sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in vanilla. Combine flour, baking powder and salt; gradually add to the creamed mixture and mix well. Stir in nuts and chocolate chips.
Spread into a greased 11x7-in. baking pan. Bake at 350° for 25-30 minutes or until a toothpick inserted in the center comes out clean. Cool on wire rack. Cut into bars.