Pour the sweetened condensed milk into the bottom of the slow cooker and spread it into an even layer with a spatula. This will form the base layer that turns into a rich, gooey caramel as it cooks.
Sweetened condensed milk spread into a slow cooker
Sweetened condensed milk spread into a slow cooker
In a medium bowl, whisk together the dry yellow cake mix and the whole milk until just combined. The batter will be thick but pourable; a few small lumps are fine. Avoid overmixing, which can make the finished dessert tough instead of tender.
Slowly pour the cake batter over the sweetened condensed milk layer in the slow cooker. Do not stir; you want distinct layers so the condensed milk can bubble up and caramelize underneath while the batter forms a golden, slightly crisp top.
Cake batter being poured over condensed milk in the slow cooker
Cake batter being poured over condensed milk in the slow cooker
Drizzle the melted butter evenly over the surface of the batter. The butter will soak through as it cooks, helping the top become glossy and caramelized around the edges, similar to the browned crust on a cobbler.
Cover the slow cooker with its lid. Cook on HIGH for 2 to 2 1/2 hours, or on LOW for 4 to 4 1/2 hours, until the top is set, puffed, and deep golden brown, with bubbling caramel visible around the edges. The center should be just set but still soft and pudding-like underneath.
Finished caramel dump dessert inside the slow cooker
Finished caramel dump dessert inside the slow cooker
Once done, turn off the slow cooker and let the dessert rest, covered, for about 10–15 minutes. This short rest allows the bubbling caramel to settle slightly and the texture to thicken into a spoonable, creamy interior with crisp-edged top.
Serve the dessert warm, scooping down through the caramelized top to capture both the golden crust and the gooey caramel base in each portion. Enjoy directly from the slow cooker for a relaxed, family-style Mother’s Day treat.
Variations & Tips
For a salted caramel spin, sprinkle 1/2 to 3/4 teaspoon flaky sea salt over the top right after cooking; the salt will balance the sweetness and highlight the caramel notes. If you’d like a deeper caramel flavor, you can cook on LOW for the longer end of the range (4 1/2 hours), watching that the edges brown but do not scorch; slow, gentle heat encourages more caramelization of the sugars in the sweetened condensed milk.
