- In a large bowl, combine cake mix and pudding mix. Whisk to combine. Add milk, eggs, sour cream, peanut butter, vanilla and salt and mix until smooth. Fold in peanut butter chips.
- Grease the bowl of Crock-Pot with nonstick cooking spray. Add batter to Crock-Pot and smooth top with spatula. Cook on low for 3 1/2 to 4 hours checking at 3 hours to make sure the edges aren’t burning. Cake can be kept on warm for up to 4 hours before serving. The finished cake should be set on the sides and still gooey in the center.
- Drizzle with peanut butter and garnish with Reese’s cups and Reese’s Pieces Serve.