Ensure that you have everyting you need including all of your ingredients and supplies.
Use non-stick cooking spray and butter to grease your spatula and pan.
Place your 4 tbs of butter and 16 oz of marshmallows into a microwave safe dish.
Heat them in the microwave for 30 - 60 seconds.
Stir well.
Heat for another 30 seconds and stir.
Repeat these 30 second heatings and stirring until marshmallows are melted.
Note: You can also melt butter and marshmallows on the stovetop, see post above for instructions on this method.
Now, slowly add in 7 cups of honey nut cheerios cereal, stirring as you go.
Once you have completely combined cereal and marshmallows, transfer your mixture into your pan.
Using your spatula, gently press the mixture into the pan so the thickness is the same across the treats.
Set them aside for around 30 minutes to they can cool some.
Use a knife that has been greased to cut 16 square treats.