In a mixing bowl, combine the cassava flour, baking soda, sea salt, cinnamon (if using), and maple sugar.

In another bowl, whisk together the milk, ghee (or coconut oil), collagen peptides, and apple cider vinegar.

Pour the wet ingredients into the dry ingredients and mix until just combined.

Preheat the waffle maker and lightly grease it if needed.

Pour batter into the waffle maker, close, and cook according to the manufacturer's instructions until golden brown.

Repeat with remaining batter. Serve warm.