As soon as the butter has melted, add the mini marshmallows and cook, stirring continuously until the marshmallows are melted completely.
Turn off the heat.
Add Ritz crackers. You can gently crush them while adding them or even leave them somewhat whole. They will crush as the mixture is stirred together.
Transfer mixture to an 8x8 or 9x9 square pan that has been greased or lined with parchment paper.
Press the mixture into an even layer. Top with some larger pieces of Ritz cracker, if desired (simply for aesthetics).
Allow treats to cool completely, then cut into pieces and serve.
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Notes
STORAGE:Keep leftovers in an airtight container on the counter up to 5 days. To freeze, wrap the treats individually in plastic wrap for up 3 months. Heat the marshmallows and butter over low heat so the mixture doesn't scorch while cooking. The ultra flaky texture of the buttery crackers really shine. I didn't crush the crackers much. They will break apart as you mix. If you crush them too much, you’ll have pretty small crumbles instead of the layered effect. They’re not super attractive in the pan, so feel free to place a few decorative crackers over the top or don’t worry about!