Mix dry ingredients into medium bowl. Add egg and milk, stir to combine.
Attach upper and lower waffle plates onto Grill & Broil. Lightly oil waffle plates and preheat to 400°F.
Spoon batter onto bottom waffle plate and spread batter with a spoon to evenly distribute over the plates. Close lid and cook 6 to 8 minutes or until waffle is done.
Whisk together ½ cup powdered sugar and 1-2 Tbsp. orange juice for glaze topping.