Preheat oven to 325 degrees F°.
Whisk egg* in large bowl then pour in maple syrup, melted coconut oil, nut butter, vanilla & almond milk, & whisk once more. *If using flax egg, mix 1 tbsp ground flaxseeds with 3 tbsp water & let sit for 5 minutes before adding to recipe in place of egg.
Stir in almond flour, collagen if using, baking soda, cinnamon, pumpkin spice & half of sea salt. Fold in chocolate chips (leave some aside for the topping).
Spray 9-inch cast iron skillet with coconut oil then pour batter into the base & spread out evenly using a silicone spatula. Place last pieces of choc chips over the top, sprinkle sea salt.
Bake in oven for 19-20 min on center rack. Then, turn oven on broil and cook 1-2 additional min. Be careful cause it burns quickly, so keep an eye on it! Enjoy! :)