Belgian Sugar Waffles

INGREDIENTS

• 3 1/2 cups plus 2 tablespoons all-purpose flour
• 10 teaspoons active dry yeast
• 3/4 cup plus 2 tablespoons whole milk, room temperature
• 1 cup plus 2 tablespoons (2 1/4 sticks) unsalted butter, softened
• 5 large eggs, room temperature
• 2 teaspoons pure vanilla extract
• 1/4 cup plus 2 tablespoons granulated sugar
• 3/4 teaspoon salt
• 1 cup amber sugar or coarsely chopped light-brown sugar cubes
• Confectioners' sugar, for dusting