Grease an 8x8 inch baking dish with coconut oil and line it with parchment paper. This step is not absolutely necessary but it makes getting the fudge out the pan much easier when it's ready
In a medium bowl, whisk together all the ingredients for the peanut butter fudge base.
In a measuring cup with a pouring spout, whisk together the ingredients for the chocolate swirl topping.
Pour the peanut butter fudge base into the baking dish, then pour the chocolate layer on top using the technique described in the post.
Chill fudge for about an hour, or until firm enough to slice. Cut into pieces and enjoy or store in the fridge for later.