Huckleberry Coffee Cake from Julie Cantrell

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This was my Uncle Mel's favorite. I remember Mom making it when he came to visit.

Sift together:
... 2 cups flour
... 1 1/2 cups sugar
Add:
... 2/3 cup butter
and mix till very fine.

Remove 3/4 cup of the above mixture for topping.

Add:
... 2 tsp baking powder
... 1 tsp salt
... 2 egg yolks
... 1 cup milk
Beat three minutes.

Beat:
... 2 egg whites
till stiff, but not dry.
Fold into batter and spread into a well greased 9x13 pan.

Cover complete top of batter with huckleberries.
Sprinkle on crumb mixture and sprinkle with nutmeg.

Bake at 375 degrees for 40 to 50 minutes.