I created this cake for a holiday potluck one year. It has become one of my most requested desserts. If you prefer, you can use all semisweet chips instead of a mix. —Lisa Renshaw, Kansas City, Missouri
In a large bowl, whisk milk and pudding mix for 2 minutes. Transfer to a greased 5-qt. slow cooker. Prepare cake mix batter according to package directions, folding cherries into batter. Pour into slow cooker.
Cook, covered, on low for 4 hours or until edge of cake is golden brown.
Remove slow cooker insert; sprinkle cake with baking chips and chocolate chips. Let cake stand, uncovered, for 10 minutes. Sprinkle with pistachios before serving.