king cake recipe

Ingredients: For the Cake: 1/2 cup warm water (about 110°F/43°C) 2 packages active dry yeast (4 1/2 teaspoons) 1/2 cup granulated sugar, divided 4 cups all-purpose flour 1 teaspoon salt 1 teaspoon ground cinnamon 1/2 cup warm milk 5 large egg yolks, at room temperature 1/2 cup unsalted butter, melted and cooled