First, break up the vanilla almond bark or chips into small pieces. Microwave them in short bursts, stirring in between, until completely melted and glossy. Spread this layer evenly on your lined baking sheet — this will be the canvas for your swirls.
In a separate bowl, melt the butterscotch chips the same way, stirring often so they don’t burn. Once smooth, spoon the butterscotch over the vanilla layer and use a skewer or knife to swirl the two together, creating a marbled effect.
Sprinkle pretzels, nuts, and toffee evenly over the swirled surface, then finish with a light dusting of sea salt. Let the bark chill at room temperature or in the fridge until completely firm, about 20-30 minutes.
Once set, gently break the bark into irregular pieces with your hands or a knife. Arrange them on a platter and dig in — or wrap them up as homemade gifts!