• Line a 9x13 inch pan with non-stick foil.

For layer 1:

• Melt marshmallows, peanut butter, butter, chocolate syrup and corn syrup in a medium saucepan over medium heat.
  10 oz marshmallows, 2 tbsp unsalted butter, 1 tbsp corn syrup, 1 tbsp chocolate syrup, 1/3 cup creamy peanut butter
• Add cereal to melted marshmallow mixture; stir quickly and well to evenly coat the cereal.
  3 cups Rice Krispies cereal
• Quickly stir in Reeses Pieces candy.
  1/2 cup Reeses Pieces candy
• Press mixture evenly into the bottom of the pan.

For layer 2:

• Place the peanut butter baking bits and sweetened condensed milk in a medium pan over medium heat, stirring continuously until melted and smooth
  11 oz peanut butter baking bits, 14 oz sweetened condensed milk
• Add peanut butter and vanilla, stirring to combine.
  1/2 cup creamy peanut butter, 1 tsp vanilla extract
• Spread peanut butter fudge mixture over the first Krispie treat layer.
• Evenly scatter the mini peanut butter cups over the peanut butter fudge, lightly pressing them into the peanut butter mixture
  8 oz mini peanut butter cups

For layer 3:

• Melt marshmallows, butter, peanut butter, chocolate syrup and corn syrup in a medium saucepan over medium heat.
  10 oz marshmallows, 2 tbsp unsalted butter, 1 tbsp corn syrup, 1 tbsp chocolate syrup, 1/3 cup creamy peanut butter
• Add cereal to melted marshmallow mixture; stir quickly and well to evenly coat the cereal.
  3 cups Rice Krispies cereal
• Quickly stir in Reeses Pieces candy.
  1/2 cup Reeses Pieces candy
• Drop spoonfuls of the cereal mixture over the previously prepared layers pressing the cereal together and slightly into the peanut butter fudge layer.

For layer 4:

• Melt the peanut butter and chocolate together either in a microwave, stirring often, or over a double boiler.
  1 cup creamy peanut butter, 2 cups chocolate
• Cool slightly and pour over the Krispie treats, smoothing with the back of a spoon or a spatula.
• Allow the treats to cool, then refrigerate until the ganache is fully set (30-60 minutes).
• Use the foil to lift the treats from the pan, slice into bars and serve.