Preheat oven to 350.

Grease 8" baking pan.

Combine peanut butter, butter, brown sugar and sugar in large bowl and mix until well blended.

Add in egg, milk and vanilla and beat until blended.

Combine flour, baking soda and salt and mix well in another bowl, then add to peanut butter mixture.

Beat until blended.

Spread half of batter in prepared pan.

Chop 9 Reese's into bite size pieces.

Distribute chopped peanut butter cups over batter.

Using a spoon, drop remaining batter on top of peanut butter cup pieces.

Bake 30 minutes or until browned.

Chop 3 more Reese's into pieces and press lightly into top of blondies while still warm.

Cool completely before cutting.