Melt your butter over low to medium-low heat in a large stock pot.
Add in the marshmallows and stir together. Allow to melt slowly, stirring often.
Pour in your Kellogg’s® Wild Berry Froot Loops® Cereal and stir till cereal is coated evenly.
Pour cereal into a greased 9x13 pan and press down evenly. (Don't squish too hard or the cereal will harden)
Allow the bars to set for a little bit to cool, before slicing.