Grease and line a brownie pan with non-stick baking paper.

Measure the peanut butter and honey into a large microwave safe bowl and mix together.

Place the bowl in the microwave and cook for 30 seconds at a time, stirring in between, until the mixure is boiling and starting to thicken. This will usually take 2-3 minutes.

Working quickly, pour the puffed rice cereal into the peanut butter and honey mixture and stir until well combined.

Tip the mixture into the lined pan then press down into the tin to form an even layer.

Place in the fridge to set for around an hour, then remove and slice into bars.