Overnight Chocolate-Hazelnut Breakfast Buns Recipe

For the Dough: In the bowl of a stand mixer, combine flour, sugar, yeast, salt, and baking soda. Melt butter in a 2-quart saucier over low heat, then stir in milk and yogurt, warming to about 80°F (27°C). Add butter/milk/yogurt mixture to flour mixture and stir to form a very dry and shaggy dough. Using hook attachment, knead dough on low until silky-smooth and elastic, capable of being gently stretched into a thin but rough sheet without tearing, about 20 minutes.

First Rise: Cover bowl with plastic and set dough to rise until puffy, light, and doubled in bulk, about 1 1/2 hours at roughly 70°F (21°C). If dough feels dense, firm, or overly resilient (this is more likely in chilly months), let rest 15 more minutes before testing again.

Shaping: Turn dough onto lightly floured surface, dust with flour, and roll into 13-inch square. Spread homemade Nutella over dough in even layer, using offset spatula. Sprinkle hazelnuts on top and roll into a log, ending seam side down.

Slide an 8-inch strand of thread, unflavored dental floss, or butcher's twine under dough log until you reach the middle. Cross ends over the top and pull tight to divide log in two. Cut each half into 6 one-inch slices and arrange in parchment-lined 9- by 13- by 2-inch aluminum baking pan (or two 8-inch by 3-inch round cake pans).

Second Rise and Frosting: Cover rolls with foil and refrigerate overnight, or up to 48 hours. Meanwhile, prepare frosting by combining mascarpone, cream, sugar, vanilla, and salt in the bowl of a stand mixer fitted with whisk attachment. Whip on medium speed until sugar is dissolved and frosting is fluffy, thick, and capable of holding medium-soft peaks. If necessary, season with additional salt and/or vanilla to taste. Transfer to a disposable pastry bag or other airtight container and refrigerate until needed, up to 48 hours.

To Bake and Serve: Adjust oven rack to middle position and preheat to 350°F (180°C). Meanwhile, let buns stand at room temperature until oven is hot. When oven is hot, bake, covered, until buns are puffed and firm but pale, about 30 minutes. (If using darker pans, check on the buns a little sooner.) Remove foil and continue baking until buns are lightly browned, about 15 minutes more. Snip a corner from bag of frosting and squeeze over each bun; alternatively, spoon frosting over buns. Serve immediately, as buns do not hold up well over time.