Line 8×8 pan with parchment paper. Put peanut butter, chocolate, butter, sweetened condensed milk, and vanilla in microwave safe bowl. Microwave on high for 30 seconds. In medium sized pot melt butter and peanut butter (for peanut butter fudge layer) over medium heat. Go back to microwave. Remove bowl and stir. Return to microwave for another 30 seconds. Repeat until completely melted and combined. Returning to the stove, when peanut butter / butter mixture is boiling, remove from heat. Stir in vanilla and powdered sugar. Quickly layer the fudge in pan: chubby hubby, peanut butter, chubby hubby. Chill until solid. Cut into tiny squares. Do your best to eat just one. Good luck!