chocolate babka

INGREDIENTS

• 1 1/2 cups warm milk, 110 degrees
• 2 (1/4 ounce each) packages active dry yeast
• 1 3/4 cups plus a pinch of sugar
• 3 whole large eggs, room temperature
• 2 large egg yolks, room temperature
• 6 cups all-purpose flour, plus more for work surface
• 1 teaspoon salt
• 1 3/4 cups (3 1/2 sticks) unsalted butter, cut into 1-inch pieces, room temperature, plus more for bowl and loaf pans
• 2 1/4 pounds semisweet chocolate, very finely chopped*
• 2 1/2 tablespoons ground cinnamon
• 1 tablespoon heavy cream
• Streusel topping (below)
• 1 2/3 cups confectioners’ sugar
• 1 1/3 cups all-purpose flour
• 12 tablespoons (1 1/2 sticks) unsalted butter, room temperature