These were one of my favorites when I was growing up.
Mix and sift flour, baking powder, and salt.
Melt butter.
Add brown sugar and stir until well blended
Cool slightly.
Add eggs, one at a time beating well after each addition.
Add vanilla.
Mix in dry ingredients; blend well.
Fold in nuts and chocolate chips.
Pour batter into greased jelly roll pan (10 x 15 x 3/4 inch).
Bake at 325 degrees for 25-30 minutes.
30 Minutes
Cut into squares.