Peanut Butter Fudge Bars

Ingredients:
 1 box Ghirardelli brownie mix, plus ingredients called for on box
 1 cup peanut butter
 1 stick softened butter
 1 tsp. vanilla
 1 c. powdered sugar
 dash salt
 1/3 cup cream

Instructions:
Prepare brownie mix according to box instructions.
Pour half batter into greased 9X9 pan.
Blend peanut butter, vanilla, salt, and sugar until smooth.
Add cream and blend until fluffy.
Drop teaspoonfuls of peanut butter mixture into pan.
Top with remaining brownie mix and twist a knife through to marble.
Bake at 350 degrees for 25-30 minutes (They will be underdone!)
Allow to cool and then chill before cutting into squares.

Recipe Source: http://www.craftster.org/forum/index.php?topic=316704.0