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Grease a 9x13 casserole pan with butter, set aside.
In a large, light colored, heavy bottomed pot, like an enameled dutch oven, melt butter over medium heat. (If you want to brown your butter for a richer flavor, follow these directions before continuing on to step 3: How To Brown Butter)
Once melted, add 2 bags of the marshmallows and stir until marshmallows are melted and the mixture is completely melted and smooth.
Remove from heat, then immediately stir in the vanilla extract and salt. Fold in crispy rice cereal, moving quickly and then fold in remaining bag of mini marshmallows.
Pour mixture into prepared pan. Using a buttered spatula, lightly press them into pan. Do not press them down too much, just spread them out. If you press them down too much they will become very dense and not as fluffy.
Allow treats to rest for at least 1 hour at room temperature too cool. Slice into squares or cut into shapes and store any leftovers in an airtight container for up to 4-5 days.