Prepare the Pan
Grease a 9×13-inch pan with butter or non-stick spray. For easy removal, you can also line it with parchment paper.

Melt the Butter
In a large pot over medium heat, melt the butter. Let it melt slowly and evenly—you want it fully melted but not browned unless you prefer a deeper flavor.

Add Most of the Marshmallows
Set aside 2 cups of marshmallows for later. Add the remaining marshmallows to the melted butter and stir constantly until smooth and fully melted.

Add Vanilla and Salt
Stir in the vanilla extract and pinch of salt. These enhance flavor and balance the sweetness.

Mix in the Cereal
Remove from heat and immediately fold in the crispy rice cereal. Stir gently to coat all the cereal in the marshmallow mixture.

Add Reserved Marshmallows
While still warm, add the remaining 2 cups of mini marshmallows. Stir gently—they should soften slightly but retain their shape for gooey pockets.

Press into Pan
Pour the mixture into your prepared pan. Gently press down with greased hands or a buttered spatula—do not compact too tightly or the treats will be dense.

Cool and Slice
Let sit at room temperature for 30–60 minutes to set. Slice into squares and serve.