Thoroughly grease a baking sheet with softened butter.
Add the butter to a large pot set over medium heat. Allow it to melt and bubble up, swirling the pot to keep it moving around, until the butter is a medium golden brown, 3 to 4 minutes. Stir in the regular marshmallows until they're totally melted. Stir in the salt.
Remove from the heat and pour in the cereal, folding gently the whole time until combined. Then pour in the mini marshmallows and gently fold in. Turn the mixture into the buttered baking sheet and press flat. Let cool completely, and then cut into squares or rectangles.
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