Chocolate Babka

Name: Chocolate Babka
Prep time: 1 h 10 min
Cook time: 50 min
Total time: 2 h
Cuisine: European
Ingredients: 2 cups all-purpose flour; 1/4 cup water; 1 3/4 teaspoons active dry yeast*; 3 tablespoons granulated sugar; 1 1/2 teaspoons kosher salt; 2 eggs ((large)); 1 egg yolk ((large)); 12 tablespoons unsalted butter ((1 1/2 sticks), softened); 6 ounces semi-sweet chocolate ((roughly chopped bar or premium quality chips)); 6 tablespoons unsalted butter; 1 1/2 tablespoons granulated sugar; 6 tablespoons unsalted butter; 3/4 cup all-purpose flour; 1/3 cup granulated sugar; 2 1/2 tablespoons unsweetened cocoa powder; 1/8 teaspoon kosher salt; powdered sugar