Preheat the oven to 350F degrees.

First, make the cherry filling. To do this, combine cherries, sugar, and corn starch in a 9x13 baking pan. Add the ingredients in and toss to coat evenly. 

Next, make the crisp topping. Either use room temperature butter or melt it slightly in the microwave. In a medium bowl add the softened butter, oats, flour, sugars, salt and cinnamon. Using your hands or a fork, combine everything together until it is crumbly and the butter is evenly spread throughout the mixture. 

Add the crisp topping on top of the cherry mixture and evenly coat. 

Bake in the preheated oven for 45-50 minutes or until the top is golden brown. 

Let it cool for about 15 minutes and then spoon into a bowl and top with vanilla ice cream if you'd like and enjoy! The filling will thicken up the more it cools.