Blueberry Cheesecake Crumb Cake

Ingredients:

Crumb Cake:
3 and 1/3 cups flour
2 teaspoons baking powder
¼ teaspoon salt
2/3 cup butter-cold and cut in cubes
Grated zest from 1 lemon(optional):
1/3 cup light brown sugar
1/3 cup sugar
2 eggs