Prep Time 25 minutes mins
Cook Time 35 minutes mins
Resting Time 14 hours hrs
Total Time 15 hours hrs
For best results, ensure your starter is very active before mixing the dough, as the richness of Nutella can weigh down the loaf slightly; a long cold proof helps develop flavor and makes the dough easier to handle when filled. Keep Nutella at room temperature so it spreads easily without tearing the dough, and avoid overworking the dough once the filling is added to prevent leaks. If your kitchen is warm, shorten bulk fermentation to avoid overproofing, and if it is cool, allow more time until the dough looks airy and domed. When baking, watch the crust color during the uncovered phase and tent loosely with foil if it darkens too quickly, and always let the bread cool completely so the swirls set cleanly and slice without smearing the Nutella.