Nutella Babka

Name: Nutella Babka
Prep time: 2 h 40 min
Cook time: 50 min
Total time: 3 h 30 min
Cuisine: American
Ingredients: 1 cup + 2 Tablespoons (270ml) whole milk, divided*; 2 and 1/4 teaspoons active dry or instant yeast (1 standard size packet)*; 1/2 cup (100g) granulated sugar; 1/2 cup (8 Tbsp; 113g) unsalted butter, softened to room temperature and cut into 4 pieces; 2 large eggs, at room temperature and divided; 1/2 teaspoon salt; 4 and 1/4 cups (531g) all-purpose flour, (spooned & leveled) plus more for dusting/rolling; 2 cups (600g) Nutella, divided; 1/4 cup (50g) packed light or dark brown sugar; 1/4 cup (31g) all-purpose flour; 1/2 teaspoon ground cinnamon; 1/4 cup (4 Tbsp; 56g) unsalted butter, cold and cubed