Preheat oven to 350 degrees F. Peel the plantains and add them to a blender or food processor together with coconut milk and salt. Blend the ingredients together until a smooth and thick mixture forms. Line a baking sheet with parchment paper. Transfer the plantain dough to it. Spread it in thin layer, to cover the whole sheet. Bake the plantains for 30 mins or until golden brown.   Cut square sizes for crackers, or you can use it as flat bread. Serve with some of your favorite jam on top or eat them just plain. Serve immediately after cooling off.