Preheat oven to 350 degrees F. and lightly spray an 8-10 inch oven proof skillet with cooking spray.
In a mixing bowl cream the butter and sugar until well combined. Stir in egg and vanilla, mixing to combine. Stir in flour, baking soda and salt, stirring to combine. Stir in chips, marshmallows pecans and coconut stirring until just combined. Press into skillet and bake for 20-25 minutes or until golden and baked through. Remove and serve warm, top with ice cream if desired.