Preheat oven to 350F and lightly grease a 9 inch cast iron skillet or 9 inch square baking dish.
In large bowl combine the eggs, coconut oil, almond butter (or cashew butter), mashed bananas, vanilla extract and coconut sugar and mix really well until smooth.
Add in the almond flour, baking soda, cinnamon and salt and mix again.
Stir in the chocolate chips, reserving a few for sprinkling on top.
Pour 1/2 of the batter into the greased skillet or dish and spread evenly across the bottom. Scatter 1/2 of the marshmallows over the batter, and then spread the remaining batter over the marshmallows. Sprinkle the remaining chocolate chips and marshmallows over the top.
Place in the oven and bake for 25 – 30 minutes.
Allow to cool for at least 30 minutes prior to slicing and serving. Enjoy!