Slow Cooker Smores Dump Cake: Best Irresistible Chocolate Dessert

Slow cooker smores dump cake turns the campfire classic into a reliable no oven dessert you can make any night of the week. The method is simple: build a graham cracker base, add a chocolate dump cake layer, then finish with a toasted marshmallow cap. The slow cooker keeps the cake tender while the edges caramelize, and you never have to preheat anything. The result is an easy slow cooker dessert with the character of a chocolate marshmallow dessert and the comfort of a graham cracker dessert.

What makes this slow cooker smores dump cake work
– Low, even heat: The crock keeps the chocolate layer moist without scorching.
– Layered texture: A buttery graham base adds crunch beneath a soft, pudding-like cake.
– Timed marshmallows: Adding them at the end prevents melting into the batter so you still get a classic marshmallow cake topping.
– Pantry-friendly: Boxed cake mix, graham crackers, and a can of sweetened condensed milk do most of the work.

Ingredients
Serves 10 to 12 in a 5 to 6 quart slow cooker

Graham base
– Graham cracker crumbs: 1 1/2 cups (150 g), about 9 full sheets
– Unsalted butter, melted: 1/2 cup (113 g)
– Fine salt: 1/8 teaspoon (0.5 g)

Chocolate layer
– Chocolate cake mix: 15.25 ounces (432 g) standard box
– Whole milk: 1 cup (240 ml)
– Sweetened condensed milk: 1 can, 14 ounces (397 g)
– Mini chocolate chips: 1 cup (170 g)
– Vanilla extract: 1 teaspoon (5 ml)
– Fine salt: 1/8 teaspoon (0.5 g)

Finish
– Mini marshmallows: 3 cups (150 g)
– Extra graham crumbs for sprinkling: 2 tablespoons (15 g), optional
– Extra chocolate chips for sprinkling: 2 tablespoons (30 g), optional

Equipment
– 5 to 6 quart slow cooker
– Parchment or a slow cooker liner
– Nonstick spray
– Mixing bowls and spatula

Step-by-step instructions
1) Prepare the crock. Line the slow cooker with parchment or a rated liner. Lightly coat with nonstick spray. This protects the edges and makes serving easier.

2) Make the graham base. In a bowl, combine crumbs, melted butter, and a pinch of salt until the mixture looks like damp sand. Press evenly into the lined crock to form a compact layer.

3) Mix the chocolate layer. In a separate bowl, whisk the cake mix, whole milk, sweetened condensed milk, vanilla, and salt until smooth. Fold in the mini chocolate chips.

4) Assemble. Pour the chocolate batter over the graham base. Do not stir once in the slow cooker.

5) Cook. Cover and cook on Low for 2 hours 30 minutes to 3 hours, until the edges are set and the center is slightly glossy but not runny. Start checking at 2 hours 15 minutes. If your slow cooker runs hot, prop the lid with a wooden spoon handle for the last 30 minutes to release steam.

6) Add the marshmallows. Sprinkle the mini marshmallows evenly over the top. Cover and cook on Low for 10 to 15 minutes, just until the marshmallows are puffy and soft.

7) Optional browning. If you want toasted tops, remove the crock insert and briefly pass a kitchen torch over the marshmallows, or place the insert under an oven broiler for 30 to 60 seconds. Watch constantly. Do not use a plastic insert under a broiler.

8) Finish and serve. Sprinkle extra crumbs and chips on top. Let stand 10 to 15 minutes, then scoop warm portions with a spoon. Serve as is or with vanilla ice cream.

Tips for success
– Moisture balance: The sweetened condensed milk gives a fudge-like texture that suits a crockpot smores cake. Avoid adding extra liquid or the center will be soupy.
– Lining matters: Parchment prevents burnt edges and preserves the graham layer.
– Timing the marshmallows: Add only at the end so they hold their shape.
– Batch size: For a 4 quart cooker, reduce all ingredients by one third and check for doneness about 15 minutes earlier.
– Cleaner slices: Chill leftovers 2 hours, then cut with a damp knife. Rewarm individual pieces in the microwave for 15 to 20 seconds.

Variations
– Peanut butter cup: Swirl 1/3 cup (85 g) warmed peanut butter into the chocolate layer and top with chopped peanut butter cups.
– Dark chocolate: Use dark chocolate cake mix and bittersweet chips for a less sweet profile.
– Double graham: Add 1/4 cup (30 g) extra graham crumbs between the chocolate batter and marshmallows for more crunch.
– Gluten-free: Use certified gluten-free graham crackers and a gluten-free chocolate cake mix. Check labels on all components.

Make-ahead, storage, and reheating
– Make-ahead: Assemble the graham base up to 24 hours ahead and refrigerate. Mix the chocolate layer right before cooking for best rise.
– Storage: Cool completely. Cover and refrigerate up to 4 days. The marshmallows will soften over time.
– Reheat: Warm portions in the microwave 15 to 30 seconds. To refresh the top, scatter a few fresh marshmallows before reheating.

Texture and doneness guide
– Set edges, glossy center: Ready for marshmallows. The interior should look like a soft pudding cake, not dry.
– Too runny: Cook covered on Low 15 to 30 minutes more. If excess moisture remains, vent the lid slightly.
– Dry edges: Reduce total cook time next batch and line the crock more carefully.

Serving ideas
– Classic: Scoop with a spoon and add a small scoop of vanilla ice cream.
– Crunch factor: Scatter crushed grahams just before serving.
– Salted finish: A light pinch of flaky salt over the marshmallows balances sweetness.

Nutrition snapshot
Approximate per serving, 1 of 12: 430 calories; 20 g fat; 61 g carbohydrates; 5 g protein. Values vary by brand and portion size.

Essential Concepts
– Line the cooker, build a graham base, pour chocolate batter, cook low and slow.
– Add marshmallows in the last 10 to 15 minutes only.
– Aim for set edges and a glossy center for the right texture.
– Serve warm. Refrigerate leftovers and reheat briefly.

FAQs
Q: Can I use water instead of milk?
A: Yes. Replace the milk with 1 cup (240 ml) water for a lighter texture. The cake will be a bit less rich.

Q: Can I cook on High?
A: You can, but watch closely. Cook about 1 hour 30 minutes to 1 hour 45 minutes to reach the same doneness, then add marshmallows for 8 to 10 minutes. High increases the risk of scorching the edges.

Q: Do I need eggs or oil with the cake mix?
A: Not for this chocolate dump cake style. The milk and condensed milk supply moisture and fat.

Q: How do I toast the marshmallows without a broiler?
A: Use a kitchen torch with light passes, or skip toasting and rely on the slow cooker to melt them gently.

Q: Can I use large marshmallows?
A: Yes. Cut them in halves and scatter evenly. They may melt into larger pools rather than a uniform cap.

Q: How do I prevent a soggy graham layer?
A: Press the crumb base firmly, line the crock, and avoid stirring the chocolate batter into the base. Vent the lid near the end to release steam if the cooker traps lots of moisture.

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