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Brown the butter in a large pan. The butter will foam, then start to turn a clear pale brown, with small brown bits floating to the top.
Add the salt, vanilla and marshmallows and stir until everything is melted and combined.
Add the rice krispie cereal and stir to combine, then press gently into a pan, cut and serve!
Work quickly when combining the rice krispies with the marshmallow mixture, as it will be sticky and will harden as it cools.
So delicious, and such an easy way to take your basic rice krispie treats from good to AMAZING!
Ice Cream Nachos