Baking a chocolate babka is no casual undertaking. The Eastern European yeast-risen coffee cake has 14 steps and takes all day to make. But the results are worth every sugarcoated second – with a moist, deeply flavored brioche-like cake wrapped around a dark fudge filling, then topped with cocoa streusel crumbs.
If you want to save yourself a little work and love Nutella, you can substitute 1 1/2 cup (420 grams) of it for the homemade fudge filling. Also note that you can make this over a few days instead of all at once. Babka freezes well for up to 3 months, so if you need only one loaf now, freeze the other for later.