Preheat oven to 400 °F. Line a baking tray with parchment paper. Set aside.
Combine coconut milk (or water) and apple cider vinegar (or lemon juice) in a small bowl. Set Aside,
Whisk together cassava flour, collagen, salt, and soda in a large bowl. Set aside.
Cut the butter or coconut oil into the dry ingredients using a food processor or a pastry cutter (or two knives) until crumbly.
Add the liquid ingredients to the flour mixture and stir to combine. Don't over-mix. Add a little additional water if the dough is too dry.
Use a cookie scoop to form dough balls approximately 2-inches in diameter separated by two inches.
Bake in the preheated oven for 25-30 minutes, until golden on top.
Serve immediately or freeze for later consumption.