Spray a 6-7 quart slow cooker with nonstick cooking spray.
Prepare the Pillsbury™ brownie mix as directed on the back of the box.
Pour brownie mixture into prepared slow cooker.
Whisk pudding mix and milk in a bowl until smooth.
Pour pudding over the brownie mix in the crock pot.
Cook on high power 2-3 hours. Start checking after 2 hours to see if the edges are dry. The cake is lava cake so a portion will remain gooey.
Serve warm topped with ice cream.