Potatoes are a good source of vitamin B6, vitamin C, copper, potassium, manganese, and dietary fiber. Potato starch adds a light texture to yeast breads, muffins, and quick breads. In cookies, it adds structure without the grittiness so often associated with gluten-free baking. It helps keep all your gluten-free baked goods moist and fresh. Potato starch is also a great thickener and is naturally gluten free.