Pre-heat oven to 300 degrees.
Mix together the ingredients listed in the Cinnamon-Sugar Topping and reserve until end.
In bowl of mixer, combine dry ingredients: sugar, brown sugar, cake flour, salt, baking powder. Using paddle attachment, turn mixer to low and mix until combined.
Add sprinkles (if desired).
Add oil and extract and mix until clumps start to form.
Spread onto parchment-lined baking sheet.
Bake for 20 minutes. Crumble will come out of the warm oven soft, but will harden over time.
Immediately (while crumble is still warm) sprinkle with Cinnamon-Sugar Topping and stir until all pieces are coated.
Once cooled, store in air tight container in fridge for up to two weeks, or in freezer for a month.