Spray a 9"x13" baking dish with non-stick spray.
Melt butter in a large (8 quart) pot over medium-low heat. Once butter is completely melted, add 7 cups of marshmallows and the caramel bits. Stir to combine. Stir occasionally until the marshmallows and caramels melt completely.
Once the mixture is smooth and combined, add the cereal and salt. Stir to combine. Add the remaining 4 cups marshmallows. Stir until combined.
Scoop into your prepared baking dish. Gently press into your baking pan. The more you press them down, the denser they become. I love light and airy, ooey-gooey treats. So, press gently.
Cut treats and serve. Enjoy!
