Step 1

Line an 8x8 or 9x9 inch square pan with parchment paper or aluminum foil and spray lightly with non-stick cooking spray. Leave an overhang around the edges.

Step 2

In a large microwave safe bowl add the peanut butter, butter and chocolate chips.

Step 3

Microwave for 45-second intervals on medium power, stirring between each interval until everything is melted.

Step 4

Stir until the mixture is evenly mixed together and allow to cool slightly for 5 minutes.

Step 5

Stir in the Rice Krispies and marshmallows.

Step 6

Pour the mixture into the prepared pan, spread into the corners of the pan.

Step 7

Chill in the fridge for 3 hours or until set.

Step 8

Lift the bars out of the pan using the overhang from the parchment paper or aluminum foil. Cut into squares and serve.