Sourdough Waffles Recipe

Name: Sourdough Waffles Recipe
Ingredients: 5 ounces all-purpose flour, such as Gold Medal (1 cup, spooned; 142g); 1 1/2 teaspoons baking powder (1/4 ounce; 6g); 1 ounce granulated sugar (2 tablespoons; 30g); 1 teaspoon (4g) Diamond Crystal kosher salt; for table salt, use half as much by volume or use the same weight; 2 large eggs (3 1/2 ounces; 100g); 6 ounces whole milk (3/4 cup; 170g); 8 ounces sourdough starter, unfed/discard (1 cup; 226g) (see note); 1 1/2 ounces unsalted butter, melted (3 tablespoons; 40g), plus more for serving; Maple syrup, for serving