I chose to make this for the tag game and unfortunately tried while not feeling well. I don't know what I did wrong, but the crumb mixture wound up being the consistency of almost cookie dough consistency. I made the recipe as written and the flavors were very nice, but the topping error kept this from being as wonderful as the recipe sounds. I am not giving this a rating, because it was my error. I thought by posting this others would be careful when assembling the crumb topping.
Because I was making this to serve with a meat meal, I didn't use dairy sour cream, substituting Tofutti's Sour Supreme instead. I shouldn't have bothered. I decided to make this last night for tonight's Sabbath dinner, and it smelled so good cooling on the counter I just had to have a taste. We were going to be "just family" for dinner, so a missing piece would not go amiss. But my daughter Didi came over to see why I was groaning in pleasure and of course, she had to taste, and then she offered a taste to her friend who came over to study with her. Mistake #2 was letting this stay on the counter overnight, albeit covered in Saran wrap. Sushiman's son came in sometime around midnight and polished off another quarter of the cake (he's a growing boy with an appetite to match). Then I had to have a slice with a cup of tea this morning. There's about 1/3 of the cake left, so I might as well make another for dessert not, except I'm out of Sour Supreme. I should have just gone with the dairy sour cream and treated everyone to a sweet Thursday night. Thanks for the recipe, now I know it's going to be a hit!