Preheat Oven 350°F Grease 8x4 loaf pan

Sift together flour, baking soda, and salt. In seperate bowl cream brown sugar and peanut butter. Beat in egg and vanilla until smooth.

Alternately add flour and buttermilk into peanut butter mixture, mixing until smooth each time. Add chocolate chips if desired.

Bake @ 350 for 45 minutes to and hour, or until done.