Add cherries to large saucepan with Splenda and simmer the berries for ~5-10 min. Once the cherries have released liquid, add corn starch and stir, let thicken (about 5-8 min). Remove from heat and set aside.
Preheat oven to 350F.
Combine crumble topping ingredients until you have a solid dough ball.
Lightly grease a 9x9 baking pan, pour in cherry filling, and then crumble the dough ball over top, creating an even topping layer.
Bake for 15 min, remove from oven, and let cool slightly. Cut and serve with ice cream or whipped cream and enjoy!