Preheat oven to 350F. Grease a two small loaf pan. Pour out jar into a large bowl. In another bowl combine peanut butter and butter, cream together. Mix in the eggs and vanilla. Alternately add the dry ingredients and the buttermilk to the peanut butter mixture. Divide into two pans. Bake for 45 minutes or until a knife inserted into the center of the bread comes out clean. Cool for 10 minute before removing from pan, Cool on a wire rack.
