Lightly grease the inside of your slow cooker with cooking spray or a little butter.
In a large mixing bowl, combine the brownie mix, eggs, melted butter, and milk. Stir until well combined and smooth.
Pour the brownie batter into the prepared slow cooker.
Cover and cook on low for 3 to 4 hours, or until the edges are set and the center is still slightly gooey.
Turn off the slow cooker and let the brownie pudding cool for about 15 minutes before serving.
Variations & Tips
For a richer flavor, try adding a teaspoon of vanilla extract or a tablespoon of espresso powder to the batter. You can also mix in a handful of chocolate chips or chopped nuts for added texture. If you prefer a less sweet version, consider using dark chocolate brownie mix. For a festive touch, sprinkle some powdered sugar or cocoa powder on top before serving.