In a small saucepan, combine soup, spinach, 1/2 cup milk and chicken; cook over medium heat 5-7 minutes or until heated through, stirring occasionally. If desired, stir in additional milk for a thinner consistency. Remove from heat; cover to keep warm., For waffles, in a large bowl, whisk flour, sugar, baking powder and salt. In another bowl, whisk eggs, milk and melted butter until blended. Add to dry ingredients; stir just until moistened., Bake in a preheated waffle iron according to manufacturer’s directions until golden brown. Cut each waffle in half. Serve with sauce; sprinkle with cheese.