Crockpot Cherry Dump Cake

1 (21 oz) can cherry or blueberry pie filling
1 package yellow or white cake mix
8 tablespoons butter, cut up
1/2 C. chopped pecans or walnuts, toasted if you have time

Rub the slow cooker generously with some of the butter. Place pie filling in the slow cooker. Mix dry cake mix and remaining butter until crumbly, sprinkle over filling. Sprinkle with nuts. Cover and cook on low for 2 – 3 hours. Serve warm in bowls.