Lightly grease the inside of your slow cooker with cooking spray or a bit of butter.

In a large mixing bowl, combine the brownie mix, eggs, and vegetable oil. Stir until well combined.
Pour half of the brownie batter into the slow cooker, spreading it evenly.
Drizzle the hot fudge sauce over the batter, then pour the remaining batter on top, spreading it evenly again.
Cover and cook on low for 2 to 3 hours, or until the edges are set and the center is just slightly gooey.
Turn off the slow cooker and let the brownies cool for about 15 minutes before serving.
Serve warm with additional hot fudge sauce drizzled on top, if desired.
Variations & Tips
For a nutty twist, add a handful of chopped walnuts or pecans to the batter before cooking. If you have chocolate lovers in the family, mix in some chocolate chips for extra gooeyness. For those who enjoy a hint of fruit, try adding a layer of raspberry jam between the brownie layers. You can also experiment with different flavors of brownie mix, like dark chocolate or caramel, to suit your family’s taste preferences.