01 - 
                Spray a 9×13-inch baking dish with non-stick cooking spray and set aside.
              
              
              
                02 - 
                In a large pot over medium-low heat, add the butter and 1/2 cup of caramel sauce. Stir constantly until the butter melts.
              
              
              
                03 - 
                Add the kosher salt and marshmallows, stirring until the marshmallows are fully melted and the mixture is smooth. Remove from heat.
              
              
              
                04 - 
                Spray a rubber spatula with non-stick spray to prevent sticking.
              
              
              
                05 - 
                Fold in the Rice Krispies cereal with the spatula until well-coated with the caramel and marshmallow mixture.
              
              
              
                06 - 
                Transfer the mixture to the prepared baking dish, pressing it into an even layer.
              
              
              
                07 - 
                Allow the bars to cool to room temperature, about 30 minutes to an hour.
              
              
              
                08 - 
                Drizzle the remaining caramel sauce over the cooled bars and sprinkle with kosher salt for garnish before cutting and serving.