Place marshmallows and peanut butter in a microwavable safe bowl. Microwave for 10 seconds, stir and place back in for about 5-10 seconds more. Take out and mix well.
Stir in the powder sugar then take it out of the bowl and knead. Careful, it’ll be a little hot. Let cool, then give to the kids to play with.
The playdough is a little oily from the peanut butter so it can be a little messy.
Have fun playing and then enjoy eating it after they are all done!