Preheat the oven to 350?F (175?C).

In a mixing bowl, combine the cherries, granulated sugar, cornstarch, vanilla extract, and lemon juice. Toss until the cherries are well coated.

Transfer the cherry mixture to a baking dish.

In another bowl, mix together the flour, oats, brown sugar, melted butter, and cinnamon until crumbly.

Sprinkle the crumble topping evenly over the cherry filling in the baking dish.

Bake in the preheated oven for 30-35 minutes, or until the topping is golden brown and the cherries are bubbling.

Remove from the oven and let cool slightly before serving.