Line a 9×13 inch pan with parchment paper or lightly grease it with cooking spray. This step makes it easier to lift and cut the squares later.

In a large pot over medium heat, melt the butter completely. Stir it gently so it doesn’t brown unless you want that nutty flavor (which is delicious, by the way).

Pour in the mini marshmallows and stir continuously until they melt into a smooth, creamy mixture.

Stir in vanilla extract and a pinch of salt. This simple step makes a huge difference in taste.

Remove the pot from heat and gently fold in the crispy rice cereal. Stir until every piece is coated with the marshmallow mixture.

Transfer the mixture to your prepared pan. Use a buttered spatula or lightly greased hands to press it evenly into the pan. Don’t press too hard or the treats will turn dense.

Let the treats cool for about 30 minutes before slicing into squares.