Preheat the oven to 350°F (175°C).

In a mixing bowl, combine the pitted cherries, granulated sugar, cornstarch, vanilla extract, and lemon juice. Stir until well mixed.

Pour the cherry mixture into a greased baking dish.

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

Spread the topping evenly over the cherry filling in the baking dish.

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

Remove from the oven and let cool slightly before serving.