Grab your ingredients and supplies.
Toss around 10 marshmallows and 1 tbs of butter into a microwave safe bowl.
Heat them together in the microwave for 20 - 30 seconds.
Remove and stir them well.
Heat again for 20 - 30 seconds and stir. Marshmallows should be well melted. If not, you can do an additional heat cycle.
Measure and add 1.25 cups of cereal to your marshmallows.
Gently fold the cereal into your marshmallows.
Take the cereal and marshmallow mixture and put it into your rectangular pyrex. If you don't have one, you can simply press and shape the treats on a plate or on wax paper.
Let the treats cool for 15 minutes or so. You can pop in the fridge to cool faster for a few minutes if wanted.
Use a knife which has been greased and cut into 4 treats.