Preheat your oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish with cooking spray or butter.
Open both cans of cherry pie filling and spread them evenly across the bottom of your prepared baking dish. If using the optional almond extract, gently fold it into the cherry filling before spreading.
Evenly sprinkle the dry cake mix over the cherry filling. Resist the urge to stir or mix the layers.
Arrange the thin slices of cold butter over the dry cake mix, trying to cover as much of the surface as possible.
If using, sprinkle the sliced almonds across the top of your cake.
Place your baking dish on the middle rack of your preheated oven and bake for 45-50 minutes. You'll know it's done when the top is golden brown and the edges are bubbling.
Allow your dump cake to cool for at least 15 minutes before serving.