Belgian Waffles with Homemade Cinnamon Sugar Butter and Sauteed Cider Apples

Name: Belgian Waffles with Homemade Cinnamon Sugar Butter and Sauteed Cider Apples
Ingredients: 1 3/4 cups all-purpose flour; 2 teaspoons baking powder; 1/4 teaspoon baking soda; 3 tablespoons sugar; 1/2 teaspoon fine salt; 3 large eggs; 1/2 cup (1 stick) unsalted butter, melted and cooled, plus more for waffle iron; 1 1/2 cups buttermilk; 2 cups apple cider; 1 tablespoon light brown sugar; 2 cinnamon sticks; 2 tablespoons unsalted butter; 2 Granny Smith apples, peeled, cored, and thinly sliced; 1 cup heavy cream; Pinch fine sea salt; 3 tablespoons granulated sugar; 2 teaspoons ground cinnamon; Special equipment: waffle iron