Grease a 9x 13 pan with butter or nonstick cooking spray.

In a large pan or stockpot, melt the butter over low-medium heat on the stovetop.

Add the mini marshmallows to the melted butter and stir while continuing to heat over low. Use a spatula to

stir constantly so the marshmallow does not burn on the bottom of the pan. Stir until the marshmallows are completely melted into the butter.

Remove from heat and add the Lucky Charms into the marshmallow mixture.

Stir until the cereal is fully coated with the melted marshmallow mixture.

Spread into the prepared pan. Use the palms of your hands to press the marshmallow treats evenly into the pan

If desired, strategically place a few additional marshmallows on the top and press them down into the bars.

This is optional, but give the marshmallow treats a little more character.

Allow them to cool completely. Cut into bars and serve.