Crumb topping:
2 cups Brown Sugar
3 tablespoons All-Purpose Flour Or Whole Wheat Pastry Flour
1 1/2 teaspoons Cinnamon, Ground
6 tablespoons Cold Butter, Cubed

Cake:
3/4 cup Cold Butter
1 1/2 cup Granulated Sugar
4 whole Eggs
2 teaspoons Vanilla Extract
1 1/2 teaspoons Baking Soda
1 1/2 teaspoons Baking Powder
1/4 teaspoons Sea Salt
3 cups All-Purpose Flour Or Whole Wheat Pastry Flour
1 1/2 cups Sour Cream
2 cups Blueberries