For the Tangzhong

• 100 grams milk (1/4 cup plus 3 tablespoons)
• 20 grams bread flour (2 tablespoons)

For the Bread

• 125 grams warm (100°F) milk (1/2 cup plus 1 tablespoon)
• 1 tsp active dry yeast
• 50 grams granulated sugar, plus a pinch (1/4 cup)
• 335 grams bread flour, plus more for work surface (2 2/3 cup)
• 16 grams cocoa powder (3 tablespoons)
• 1/2 tsp coarse salt
• 1 large egg
• 55 grams unsalted butter, cut into pieces and softened (4 tablespoons)
• 1 tsp canola oil
• all-purpose flour
• 1/2 cup Nutella

For The Eggs Wash

• 1 large egg
• 1 tsp Heavy cream