Preheat the oven to 350°F, and grease a 2.5 quart baking dish.

In a medium bowl, combine oats, butter, flour, brown sugar, granulated sugar, salt, and cinnamon. The consistency should resemble damp sand, and there should be no dry patches. Set aside.

In a separate large bowl, combine the pitted cherries, granulated sugar, cornstarch, lemon juice, and cinnamon.

Transfer the cherries to the prepared baking dish, and sprinkle the oat topping over the cherries in an even layer.

Bake for 30 to 35 minutes until the topping is golden brown and the filling is bubbly around the edges.

Serve with a scoop of vanilla ice cream. See post for storage recommendations.