Cinnamon Babka | America's Test Kitchen

Name: Cinnamon Babka | America's Test Kitchen
Total time: 600 min
Ingredients: 2 cups (10 ounces/283 grams) all-purpose flour; 1 1/2 teaspoons instant or rapid-rise yeast; 1/2 teaspoon table salt; 1/2 cup whole milk, room temperature; 1/4 cup (1¾ ounces/50 grams) sugar; 2 large egg yolks; 1 teaspoon vanilla extract; 8 tablespoons unsalted butter, cut into 8 pieces and softened; 1 cup packed (7 ounces/198 grams) light brown sugar; 1/4 cup (1¼ ounces/35 grams) all-purpose flour; 2 tablespoons unsalted butter, melted and cooled; 1 large egg white; 2 teaspoons ground cinnamon; 1/8 teaspoon table salt; 1 large egg, lightly beaten with 1 tablespoon water and pinch table salt

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This rich bread is defined by its many twisting layers of gooey cinnamon-sugar filling. But the dough was so rich and tender that the fabulous filling made it collapse.