Do NOT Preheat oven.

Drain the cherries well. Mix just the egg yolks, sour cream, sugar, flour and baking powder until smooth. Next beat the egg whites until they’re stiff, then fold into the batter. Spread batter onto a baking sheet with low sides that’s lined with parchment paper. Spray parchment paper with non stick spray.

Sprinkle the cherries lightly over the batter, but don’t press them into the dough. Mix the sugar and flour. Cut in the butter with your fingertips until the mixture forms medium crumbs. Spread topping all over the cherries. Put in a cold oven and bake at 400 degrees for 30 minutes.