Get all the things you need: Rice Krispies, marshmallows, a stick of butter, a mixing bowl, a measuring cup, and a pan, and a pot.
Cut the butter into 3 tablespoons.
Measure out 6 cups of rice krispies in the bowl.
Butter the pan.
Melt the butter.
Melt the marshmallows along with the butter until they turn into a liquid.
Mix the butter, marshmallows, and rice krispies together.
Pour it all in your pan.
Flatten it out and wait for it to cool down.