Preheat the oven to 350°F (175°C). In a mixing bowl, combine the pitted cherries, granulated sugar, cornstarch, vanilla extract, and lemon juice. Mix well and set aside.

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

Pour the cherry mixture into a 9-inch baking dish. Evenly spread the oat topping over the cherries. Bake in the preheated oven for 30 minutes or until the topping is golden brown and the cherries are bubbly.

Let the cherry crisp cool for a few minutes before serving. Enjoy warm, optionally with vanilla ice cream.