In a large bowl, combine the first 9 ingredients. In a small bowl, whisk the eggs, buttermilk, pumpkin and melted butter. Stir into dry ingredients just until moistened.
Bake in a preheated waffle maker according to manufacturer’s directions until golden brown. Serve with butter and syrup if desired. Freeze option: Cool waffles on wire racks. Freeze between layers of waxed paper in an airtight freezer container. To use, reheat waffles in a toaster on medium setting. Or, microwave each waffle on high for 30-60 seconds or until heated through.