Add the marshmallows and butter to an extra large mixing bowl. Microwave for 2 minutes and 30 seconds or until the marshmallows have risen near the top of the bowl.
Remove and stir until no chunks of butter or marshmallow are visible. If you have some chunks after stirring, simply return it to the microwave for 10 seconds at a time until smooth.
Place the Cinnamon Toast Crunch in the bowl, quickly, and stir to coat all of the cereal.
Place the cereal and marshmallow mixture into the pan and press even. I tend to spray one of my hands with the nonstick spray to make this step easier and quicker.
Let the treats rest for 1 hour or until set. Cut and enjoy!
