Chocolate Hazelnut Buns Recipe

Ingredients (15)

• 16 ounces all-purpose flour, such as Gold Medal (about 3 1/2 cups, spooned; 450g), plus more for rolling
• 3 1/2 ounces sugar (about 1/2 cup; 100g)
• 2 teaspoons instant yeast, such as SAF (not rapid-rise; see note)
• 2 teaspoons (8g) Diamond Crystal kosher salt; for table salt, use about half as much by volume or the same weight
• 1/4 teaspoon baking soda
• 4 ounces unsalted butter (8 tablespoons; 115g)
• 4 ounces milk (8 tablespoons; 115g), any percentage will do
• 8 ounces plain, unsweetened, strained Greek yogurt (about 1 cup; 225g), such as Fage (see note)
• 12 ounces homemade Nutella (about 1 1/3 cups; 340g), creamy or crunchy (see note)
• 4 ounces skinned toasted hazelnuts, roughly chopped (a shy cup; 115g), or more to taste
• 4 ounces mascarpone (about 1/2 cup; 115g)
• 4 ounces heavy cream (about 1/2 cup; 115g)
• 1 3/4 ounces plain or toasted sugar (about 1/4 cup; 50g)
• 1/8 ounce vanilla extract (about 3/4 teaspoon; 4g), or more to taste
• 1/4 teaspoon (1g) Diamond Crystal kosher salt, or more to taste; for table salt, use about half as much by volume or the same weight