Divide butter into 1 tbsp sections and add them to the four microwave safe bowls.
Add one color of Peeps to each of the bowls of butter.
Microwave the first bowl of Peeps and butter until they are fully melted. Do this in 30 - 60 second intervals, checking and stirring before adding more time.
When melted, add in 1.5 cups of the Rice Krispies cereal and thoroughly stir.
Spread the mixture into your greased 9x13 pan.
Repeat with the other three colors of Peeps, layering each color on top of the previous.
Let everything cool for around 30 minutes, cut and eat.