http://www.crunchycreamysweet.com/2014/09/21/the-best-apple-crumb-cake/
There is a place to click for a printable recipe.
The streusel part:
for the topping:
1/3 cup packed light brown sugar
1/3 cup granulated sugar
1 teaspoon ground cinnamon
1/2 teaspoon salt
1/2 cup unsalted butter melted and cooled
1 and 1/2 cup all-purpose flour
to make the topping:
In a medium bowl, whisk together both sugars, cinnamon, salt and flour. Add melted butter and fluff with fork until mixtures creates crumbs. Set aside.
I usually get away with slightly warm melted butter but maybe should have cooled it completely. And this uses twice as much butter, a whole stick.
I oveermixed it. Says to fluff with fork (see above). I guess leave it lumpy/clumpy if you get that far. I might use a few drops of ice water. Dunno.
Maybe I will just make the streusel and see if it works. Eat it for a treat or set out for the birds or my possum visitor.
Now I'd better leave things be for awhile.