Lightly grease the interior of a 6-quart slow cooker using nonstick spray to ensure easy release and minimal cleanup.
Evenly spread the cherry pie filling across the base of the cooker, forming the first layer. If desired, dust the fruit layer with ground cinnamon for a subtle spiced aroma.
Distribute the dry yellow cake mix uniformly over the cherry layer, taking care not to mix or stir the layers.
Carefully pour the melted butter over the surface of the cake mix, aiming to moisten as much of the powder as possible. It is acceptable for a few dry spots to remain.
Seal the cooker with its lid and set it to cook. Choose LOW for 6 to 7 hours or HIGH for 3 to 4 hours. The dessert is ready when the surface is golden and the edges are lightly crisped.
Ladle the warm dessert into individual bowls and top with whipped cream or a scoop of vanilla ice cream, if desired, before serving.