Heat oven to 350 F.

Grease 8- or 9-inch baking pan.

Beat peanut butter, butter, brown sugar and granulated sugar in large bowl until well blended.

Add egg, milk and vanilla; beat well.

Stir together flour, baking soda and salt; add to peanut butter mixture, beating until well blended.

Spread one half of batter in prepared pan.

Sprinkle baking pieces over batter.

Drop remaining batter by 1/2 teaspoonfuls over mixture, covering baking pieces.

Bake 25 to 30 minutes or until lightly browned.

Cool completely in pan on wire rack.

Cut into bars.