Preheat the oven to 350 degrees F. Take an 8x11 or 9x9 baking dish and grease with butter or cooking spray.
Into a large bowl, add your freshly washed cranberries. Wash and zest and orange into the bowl.
Cut oranges and squeeze until you get ⅓ cup juice. Add it to the bowl.
Add ¾ cup brown sugar and the vanilla extract to the bowl and stir until everything is combined. Pour the filling into your baking dish.
In a medium bowl, add the flour, brown sugar, and room temperature butter. Mix together with a fork until the butter in incorporated and you get a crumbly texture. Pour the crumble topping over the strawberries.
Bake for 30 minutes. Remove from the oven, let cool on a cooling rack for 10 minutes, then serve.
This cranberry crumble is nicely tart. It's perfect served with some ice cream or sweetened whipped cream. If you want a sweeter cranberry crumble, add 1 cup of brown sugar to the filling instead of ¾ cup.