Place sweetened flaked coconut in a small bowl and set aside momentarily. Melt the caramel for a few seconds until mostly fluid. Stir in the vanilla extract. Add the semi-melted caramel to the sweetened flaked coconut and mix with a spatula until combined.
Line chocolate chips on the bottom of the cast iron skillet in an even layer. Spread the caramel/coconut mixture over the chocolate chips as even as you can. Arrange the marshmallow halves over the caramel/coconut mixture to cover surface of the skillet.
Place skillet in the oven for 5-6 minutes until the marshmallows have expanded and melted.
Remove from the oven. Allow to cool for a few minutes, then have at it with some graham crackers.
The calories shown are based on the recipe serving 5, with 1 serving being 1/5 of the dip. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**