Smeteneh Kuchen

I've made this very rich coffee cake a couple times now, from a recipe on Epicurious: Ashkenazic Sour Cream Coffee Cake (Smeteneh Kuchen). It's very good, if you're willing to put 1½ sticks of butter in a single dish. I can't imagine wanting to put the optional glaze on top. It sounds good, but pouring another cup of sugar on top of the streusel would take this over the top, I think.