Line a 9x5" or 8x4" loaf pan with parchment paper and set aside.
Pour the crispy rice cereal into a medium sized mixing bowl.
Add the honey, sugar, peanut butter, and salt to a small sauce pan set over low heat. Constantly stir the mixture until all the ingredients are melted and cohesive.
Pour the mixture over the cereal and stir quickly to coat the pieces.
Pour the coated cereal into your prepared loaf pan and use a rubber spatula to press the mixture into an even layer in the pan.
In a small microwave safe mixing bowl, add the dark chocolate chips, 60g (¼ c.) of butterscotch chips, and the vegetable oil. Microwave in 30 second intervals, stirring after each, until the mixture is smooth.
In a separate small microwave safe mixing bowl, melt the remaining 30g (2 tbsp.) of butterscotch chips.
Pour the chocolate butterscotch mixture into an even layer on top of the cereal in the loaf pan.
Place small dollops of the melted butterscotch on top of the chocolate, then use a knife to swirl it around. Top with flaky sea salt (optional, but delicious!)
Allow the chocolate to fully set (*you can do this quickly by placing it in the fridge for 10-15 minutes), then slice, serve, and enjoy!