Preheat oven to 350 degrees.
Into a large bowl combine flour, baking soda and salt. Using a whisk mix the ingredients until well incorporated. Set aside until needed.
Using another large bowl combine melted butter, granulated sugar and brown sugar. Whisk for 2-3 minutes until incorporated.
Next add vanilla extract, 1/2 cup of your peanut butter & egg. Combine all ingredients.
Slowly add in flour mixture until completely combined.
Next add in 1/2 cup worth of chocolate chips. Mix all ingredients together.
Grease 2 mini cast iron skillets with baking cooking spray.
Divide cookie dough batter into 4 sections. Add 1/4 of dough into the skillets. Flatten dough out.
Next evenly divide remaining 1/4 cup peanut butter into each skillet. Then add marshmallow fluff.
Finally add remaining cookie dough into each skillet.
Bake skillets in oven for 18-20 minutes until cooked all the way through.
Serving optional: Top each skillet with vanilla ice cream.
If you want to drizzle peanut butter and chocolate on top...microwave 1/2 cup chocolate chips with 1 tsp coconut oil in 30 second intervals until melted. Repeat step with remaining 1/4 cup peanut butter. Serve & enjoy!
**This dish could easily be made into 4 smaller portioned skillets, just divide the cookie dough into 8 portions before assembling.