Melt the butter on medium heat in a large pot.
Once the butter is melted, add in the condensed milk, stirring until it is combined.
Add in the vanilla extract and salt, stirring again.
Add in your large marshmallows stirring continuously until they are incorporated and melted.
Remove from the heat and add in Rice Krispies.
As the final step, stir in the mini marshmallows so they are evenly distributed throughout the Rice Krispies mixture.
In a parchment lined or greased dish, press the rice krispy mixture flat and spread to the edges until the dish is filled.
If you can wait, let them sit for 30 minutes before cutting and serving. Enjoy!
