Mix the yellow cake mix up according to the directions on the box. While doing this, melt the peanut butter down in the microwave for 1 minute. Mix melted peanut butter into the mix and pour into your desired baking pan/cupcake liners.
Pour chocolate syrup in lines up and down the length of the cake batter. Pour caramel in the spaces between the chocolate. Using a butter knife, swirl the chocolate and caramel together.