This 4-ingredient slow cooker Father’s Day obsidian bake is my easy, set-it-and-forget-it dessert that feels special without keeping you in the kitchen all day. It starts in the morning and quietly turns into a rich, dark chocolate base with craggy, toasted blonde cake on top—like a cross between a lava cake and a cobbler. It’s perfect for busy family weekends when you want something warm and comforting ready right after dinner, especially if you’re celebrating a dad who loves chocolate.
Serve this obsidian bake warm right out of the slow cooker, spooned into bowls so you get some of the gooey dark chocolate and some of the toasted blonde cake in every scoop. A little vanilla ice cream or whipped cream on top melts into the warm dessert and makes it extra cozy. Fresh berries on the side help balance the richness, and a hot cup of coffee or a cold glass of milk is perfect for sipping while everyone digs in around the table.
4-Ingredient Slow Cooker Father’s Day Obsidian BakeServings: 8
Ingredients
1 box (15.25–15.5 oz) yellow cake mix
1 can (21 oz) cherry pie filling
1 cup (about 6 oz) semisweet chocolate chips
1/2 cup (1 stick, 4 oz) unsalted butter, melted
Directions
Lightly coat the inside of a 5- to 6-quart slow cooker with nonstick cooking spray or a thin layer of butter so the dessert releases easily and the edges can caramelize without sticking.
Pour the cherry pie filling into the bottom of the slow cooker and spread it into an even layer. This will be the juicy base that bubbles up around the edges.
Sprinkle the chocolate chips evenly over the cherry layer. This is what gives you that deep, glistening obsidian pool of chocolate under the cake.
In a medium bowl, add the dry yellow cake mix. Drizzle the melted butter over the cake mix and stir with a fork until the mixture is evenly moistened and forms clumps—like a crumbly, slightly damp sand texture. Do not add eggs or water; you want a chunky, dry-ish topping.
Sprinkle this buttery cake mixture evenly over the chocolate chips and cherries, covering them completely but without pressing down too hard. Leave it a bit craggy on top so it bakes up with lots of toasted blonde peaks and valleys.
Cover the slow cooker with its lid. Cook on LOW for 4 to 5 hours, or until the top is set, the edges are deeply golden and slightly caramelized, and you can see the chocolate and cherry layer bubbling up around the sides. Avoid lifting the lid in the first 2 to 3 hours so the heat stays consistent.
Once done, turn the slow cooker to WARM and let the dessert sit for about 15 minutes. This helps the bubbling center settle a bit while still staying gooey. Spoon into bowls, making sure to dig all the way down so everyone gets some of the obsidian chocolate, cherries, and toasted cake topping in each serving.
Variations & Tips
For picky eaters who don’t love cherries, you can swap the cherry pie filling for apple, blueberry, or even peach pie filling—the process stays the same, but the flavor changes. For extra chocolate lovers, use a chocolate cake mix instead of yellow for an all-dark, molten effect. If you need it a bit less rich, cut the chocolate chips down to 3/4 cup and add a handful of chopped nuts (like pecans or walnuts) on top of the cake mixture for crunch. To make it feel more like a s’mores treat, sprinkle mini marshmallows over the top during the last 10 to 15 minutes of cooking so they puff and toast slightly with the lid cracked open. For a dairy-free version, use dairy-free chocolate chips and a plant-based butter substitute, and double-check that your cake mix is dairy-free. Food safety tips: Always cook this dessert on LOW as directed so the center heats through safely; slow cookers can vary, so if your unit runs hot, start checking at 3 1/2 hours to prevent burning around the edges. Do not leave the slow cooker on WARM for more than 2 hours after cooking, and refrigerate leftovers within 2 hours of serving in a shallow, covered container. Reheat leftovers in the microwave until steaming hot before eating. Keep the cord and hot slow cooker base away from kids’ reach, and use oven mitts when handling the ceramic insert, as it stays hot even after you turn the cooker off.
