01 -
Combine the cinnamon, sugars, salt, and ginger in a bowl. Mix in melted butter until even, then stir in nuts (if using), chocolate chips, and flour.
02 -
Heat the oven to 350°F. Butter and flour a 9-inch cake pan or springform pan, making sure it's evenly coated.
03 -
In a bowl, whisk together soda, flour, salt, and baking powder until evenly distributed.
04 -
Blend the room-temp butter and sugars until soft and airy. Mix in the eggs, one by one, then add sour cream, vanilla, and lemon juice. Gently fold in the flour mixture, chocolate chips, and nuts.
05 -
Pour the batter into your pan and sprinkle the crumble on top. Bake 45 mins, cover with foil, then bake 40-50 mins more. Let the cake rest for half an hour before cutting.