) Put butter and peanut butter in a microwaveable bowl. Cover with plastic wrap and microwave on high for 2 minutes. Remove and pull up plastic wrap and stir thoroughly. Replace plastic wrap. Place back in microwave and microwave for 2 more minutes.
) Remove from microwave and stir in powdered sugar and vanilla extract (preferably with a wooden spoon) until mixed thoroughly. Place in an 8X8 glass dish or metal pan lined with waxed paper, cover with waxed paper and flatten out top. Place in frig for 2 hours (until cooled) then cut into 1inch squares. Store in frig.