Step 1

Grease a large bowl with butter and place the Special K in the bowl.

Step 2

Grease a 9x13 or 8x11 baking dish. The 9x13 will make thinner bars, the 8x11 bars will be thicker (as pictured).

Step 3

Place sugar and corn syrup in a saucepan over medium heat. Heat the mixture stirring occasionally, until the edges start to bubble. Remove the saucepan from the heat and immediately stir in the peanut butter.

Step 4

Working quickly (before the mixture cools), pour the peanut butter mixture over the Special K and stir until combined. Scoop into the prepared baking dish and press into an even layer. Proceed with the frosting.

Step 5

Place chocolate chips and butterscotch chips in the bowl of a double boiler. Cook, stirring frequently, until melted and smooth. Note: make sure the boiling water is not touching the bottom of your bowl, only the steam.

Step 6

Immediately pour the frosting over the bars and smooth into an even layer. Sprinkle with flaky sea salt. Allow several hours for the frosting to firm up, then cut and serve.