Prepare the brownie mix according to the package directions. Allow the brownies to cool in the pan for at least 30 minutes before proceeding.
Cover the top of the brownies with the milk chocolate frosting.
Cover the top of the frosting with a layer of mini pretzels.
In a small microwave safe bowl, add the caramel bits and water. Microwave on high for 30 second intervals, stirring after each, until the caramels are melted. Use oven mits and be careful when removing the bowl from the microwave - it will be hot.
Drizzle the melted caramel over the layer of pretzels.
In another small microwave safe bowl, add the butterscotch chips. Microwave on high for 30 second intervals, stirring after each, until the chips are melted. Again, take care when removing the hot bowl from the microwave.
Transfer the melted butterscotch to a zip top bag. Twist the top of the bag closed and cut a very small snip off one corner to make a piping bag.
Drizzle the melted butterscotch over the top of the caramel layer.
Notes
To make cutting the brownies easier, use a sharp serrated edge knife.
Store at room temperature for about 3 days or longer (up to 7 days) in the refrigerator.
To freeze, cut into servings and wrap individually in plastic wrap. Freeze for up to 6 months. To serve, allow the brownies to thaw in the refrigerator overnight.