Prepare a 9x13 baking pan by spraying it well with cooking spray. Melt the butter in a large saucepan or Dutch oven on the stovetop over low to medium heat.
Then add in the vanilla extract, salt, and mini marshmallows. Continue stirring until the marshmallows have fully melted.
Remove the marshmallow mixture from the heat, and stir in the red food coloring, adding drops, 1-2 at a time, 'til you reach your desired shade of pink (I added around 5 drops or so).*
Once the mixture is your desired shade of pink, quickly stir in the Rice Krispies cereal.
Now just spread the mixture evenly and smoothly into the prepared baking pan; and at this point, you can add sprinkles if you want, before the treats cool. In order to enjoy the perfect texture, allow the treats to cool for just a bit.
Cut into serving size pieces and serve!