Brown Sugar-Cinnamon Waffles

Name: Brown Sugar-Cinnamon Waffles
Prep time: 10 min
Cook time: 28 min
Total time: 38 min
Cuisine: American
Ingredients: 8 tablespoons (1 stick) unsalted butter, plus more for serving; 2 cups all-purpose flour; 2 tablespoons packed light brown sugar; 1 tablespoon ground cinnamon, plus more for topping; 2 teaspoons baking powder; 1/2 teaspoon kosher salt; 2 large eggs; 1 3/4 cups milk; 2 teaspoons vanillla extract; Cooking spray; Maple syrup, for serving (optional)