Gather your ingredients and supplies before getting started.
Melt your butter and marshmallows together either in the microwave or on the stove. Stove directions are in the post above, microwave melting directions to follow here.
Put 32 oz of marshmallows and 8 tbs of butter into a bowl and heat for 30 - 60 seconds.
Remove from microwave and stir together well.
Put back into microwave and heat for 30 seconds.
Remove and stir together well again.
Keep heating for 30 seonds and stirring until butter and marshmallows are completely melted and mixed together.
Once melted, slowly add in 12 cups of rice krispie cereal and stir it together thoroughly.
Use spatula to spread and lightly press your treat mixture onto your cookie sheet
Let it cool for around 30 minutes, then cut into even sized squares.