Start out by making sure you have everything you need to make your treats.
Take some butter or non-stick cooking spray and grease your pan and spatula.
Add both your 16 oz of marshmallows and 4 tbs of butter into your microwave safe bowl.
Heat the marshmallows and butter in the microwave for around 30 - 60 seconds.
Once heated, remove from the microwave and stir them together.
Heat again for 30 seconds and stir again
Keep heating and stirring until they are fully melted.
Note: You can also melt the butter and marshmallows together on the stove. for those instructions, see the above in the post.
Measure 7 cups of Life cereal and slowly add into your marshmallows stirring as you go.
Carefully combine all of the cereal and marshmallows.
Use your spatula to transfer the treat mixture into your greased pan.
Continue using your spatula and lightly push the treats into the pan so they are the same consistency throughout.
Set the pan of treats aside for around 30 minutes to cool.
Cut the treats into 16 squares and serve.