Line your baking pan with parchment paper.
This prevents sticking later.
Set it aside for now.
Put butter in your saucepan over low heat.
Let it melt completely.
Don't let it burn.
Stir peanut butter into the melted butter.
Mix until smooth and creamy.
Keep the heat on low.
Add marshmallows to the peanut butter mixture.
Stir constantly until they melt completely.
This takes about 3-4 minutes.
Remove the pan from heat now.
Stir in vanilla extract and salt.
Mix everything together well.
Pour rice cereal into your mixing bowl.
Add the marshmallow mixture on top.
Fold everything together gently but thoroughly.
Transfer mixture to your prepared baking pan.
Press down firmly with your spatula.
Make the surface as even as possible.
Refrigerate for at least 2 hours.
They need time to firm up completely.
Remove from pan using the parchment paper.
Cut into 16 equal squares.
Enjoy your homemade treats!