Nutella Babka

Bahan-bahan (2 porsi)

• 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