How to Make It
Preheat the oven to 325° and line a rimmed baking sheet with parchment paper. In a medium bowl, whisk the flour with the cinnamon, salt and both sugars. Add the melted margarine and mix until pea-size clumps form. Spread the crumb topping on the prepared baking sheet and bake until brown and crisp, 20 minutes. Let cool.