Melt the butter in a large saucepan over medium-low heat. Allow the butter to brown, until small brown flakes appear at the bottom. Add the marshmallows, salt and vanilla and stir until melted - about 3 minutes
Pour the marshmallows over the cereal and use a rubber spatula to stir together, evenly covering the cereal.
Pour the cereal into your prepared pan. Use an offset spatula to gently press down and make the top even.
Melt the chocolate and 2 teaspoon of coconut oil together in a microwave. Microwave in short bursts, stirring every 15 seconds, until smooth. Pour over the rice krispie treats and use an offset spatula to cover the cereal evenly.
Melt the butterscotch chips and 1 teaspoon of coconut oil in the microwave. Microwave again in short bursts, stirring every 15 seconds. Spoon dollops of the melted butterscotch on top of the chocolate. Use a wooden skewer or butter knife to swirl together.
Sprinkle flaky sea salt on top.
Place in the fridge for one hour, then cut into 16 squares.
Notes
Butterscotch Chips: you can swap these out for peanut butter chips, caramel chips, white chocolate chips, or just use more chocolate chips. Marshmallows: you can use regular sized marshmallows or mini marshmallows. Looking for a recipe with marshmallow fluff? Check out this recipe! Storage: slice the treats into 16 bars and keep in an air tight container for up to 5 days. I do not recommend freezing these as it will alter the texture.