Louise Sheldon's Fudge Bars

Sift together flour, baking powder, and salt. Melt shortening with chocolate over very low heat. Beat sugar into beaten egg; stir in melted chocolate and butter, then sifted flour. Stir in nuts and vanilla, and mix well. Spread batter very thin on a greased 17 x 14 baking sheet, and bake for 20 minutes or less. When cool, cut into squares.