In a large pot melt the butter on medium low heat. Add the marshmallows and stir until all the marshmallows are melted. Take off the heat and stir in the cereal, making sure to coat all of the cereal with the marshmallow mix.
Pour in the prepared dish and gently press down to even it out. (I always spray my hands with cooking spray so it doesn't stick to my hands).
Sprinkle the top with your favorite sprinkles.
Let cool, then cut into squares.
I cut mine into about 2 inch squares and I will end up with about 24 bars.
ENJOY!
Recipe by Sugar n' Spice Gals at https://sugar-n-spicegals.com/reeses-peanut-butter-cereal-treats/