01 -
Coat slow cooker generously with cooking spray.
02 -
Whisk together flour, granulated sugar, cocoa powder, baking powder, and salt.
03 -
Stir in milk, vegetable oil, and vanilla extract until smooth.
04 -
Fold in one bag of peanut butter chips.
05 -
Spread the batter evenly in the prepared slow cooker.
06 -
Mix brown sugar and cocoa powder together. Add hot water and stir until the sugar dissolves.
07 -
Pour the mixture over the batter in the slow cooker without stirring. Top with the remaining peanut butter chips.
08 -
Cover and cook on HIGH for 1½ to 2 hours, or until a toothpick inserted in the center comes out clean.
09 -
Turn off the slow cooker and remove the lid. Let the cake stand for 30 to 40 minutes.
10 -
Spoon out portions and serve with the sauce from the bottom of the slow cooker.