Preheat your oven to 350 degrees F.In a large mixing bowl, mix together (with the paddle attachment or whisk) all the wet ingredients (starting with egg, through to pumpkin).After the wet ingredients are incorporated, add in all your dry ingredients (oat flour through to ginger) and mix until combined.Spray your muffin tins with cooking spray. Pour batter in each mini muffin (or reg muffin pan) about â…” full.Place in oven and bake for 11-12 min for mini-muffins, and 16-18 min for regular muffins. They'll be ready when you touch them and they spring back.Meanwhile, whisk together the icing ingredients, ending with the milk.Once muffins are completely cool, add the icing to each one with a piping back or with a knife.