My granny (Putman) used to make these when I was young. We all loved them!
Blend oil with brown sugar; mix well. Sift together flour, baking powder and salt. Add eggs, one at a time, to oil mixture, beating well after each addition. Blend in dry ingredients. Stir in chocolate chips and nuts. Spread in greased 15x10x1" pan. Bake at 350 degrees for 25-30 minutes. When almost cool, cut into 2" squares. Makes about 4 doz. bars.