Papparoti Roti Boy

Name: Papparoti Roti Boy
Ingredients: 2 cups all-purpose flour (minus 1 tablespoon); 1 ½ teaspoons yeast; 1 ½ tablespoons sugar; 1 large egg (at room temperature); ½ cup warm milk; ¼ teaspoon salt; 2 ½ tablespoons unsalted butter (soft and not melted); 1 teaspoon vanilla extract; ½ tablespoon coffee granules; ½ tablespoon warm water; 2 tablespoons unsalted butter (soft, not melted); 1 large egg white; ¼ cup + 1 tablespoon all-purpose flour; 8 frozen salted butter cubes (9 to 10 grams each)