In bowl, whisk together flour, oatmeal, cornstarch, sugar, baking powder, baking soda and salt. In separate bowl, whisk together milk, eggs and melted butter; whisk into flour mixture until smooth.
Heat and grease waffle iron. Cook waffles, using scant cupful of batter at a time, according to manufacturer's instructions. Let cool completely on rack.
Stack waffles between pieces of parchment paper; freeze in resealable plastic bag or airtight container for up to 2 weeks.
To reheat: Toast frozen waffles in toaster until golden and heated through. Serve with berries and maple syrup.
