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Chocolate Caramel Marshmallow Ooey Gooey Cake

Yasser
What happens when you combine rich chocolate, velvety caramel, and fluffy marshmallow into one irresistible dessert? The answer is this Chocolate Caramel Marshmallow Ooey Gooey Cake—a decadent treat that delivers layers of melty, gooey goodness in every bite.
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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings 12
Calories 420 kcal

Ingredients
  

Chocolate Cake Base

  • 1 box chocolate cake mix 15–16 oz
  • 1 large egg
  • ½ cup unsalted butter melted

Caramel Layer

  • 1 ½ cups thick caramel sauce store-bought or homemade
  • ½ teaspoon sea salt optional, for salted caramel flavor

Marshmallow Layer

  • 1 ½ cups marshmallow fluff or marshmallow crème
  • ½ cup soft whipped cream or whipped topping optional for lighter texture

Chocolate Ganache Topping

  • 1 cup semisweet chocolate chips
  • ½ cup heavy cream
  • 1 teaspoon vanilla extract

Final Garnish

  • ½ to 1 cup chopped chocolate candy bars or chocolate chunks milk chocolate, caramel-filled chocolates, or crispy chocolate bars work well

Instructions
 

Preheat and Prepare

  • Preheat your oven to 350°F (175°C).
  • Line or grease a 9×13-inch baking dish.

Prepare the Chocolate Cake Base

  • In a mixing bowl, combine the chocolate cake mix, melted butter, and egg.
  • Mix until a thick dough forms. It will not look like regular cake batter—this is normal.
  • Press this dough into the bottom of the baking dish, making sure it is smooth and even.
  • This base becomes chewy like a brownie and forms the foundation that prevents the caramel from soaking downward and disappearing during baking.

Prepare the Caramel Layer

  • Warm the caramel slightly so it spreads easily.
  • Add sea salt if you want a salted caramel finish.
  • Pour the caramel over the chocolate layer.
  • Use a spatula to spread it evenly.
  • The caramel should be thick. Thin caramel will disappear into the batter instead of forming a dramatic molten layer.

Add the Marshmallow Layer

  • Spread marshmallow fluff evenly over the caramel layer.
  • If using whipped cream or whipped topping, fold it gently into the fluff for a softer texture.
  • Carefully smooth the layer without mixing it into the caramel below.
  • The marshmallow softens during baking and sinks slightly, forming that perfect white ribbon in the center of the cake.

Bake the Cake

  • Place the composed cake into the oven.
  • Bake for 28–35 minutes.
  • The edges should be set, while the center remains soft and slightly jiggly.
  • Overbaking eliminates the gooey texture. Undercooking makes the cake collapse. This timing gives the perfect balance.

Prepare the Chocolate Ganache

  • While the cake cools, make the topping.
  • In a small saucepan, heat heavy cream until steaming.
  • Pour hot cream over chocolate chips in a bowl.
  • Let sit for 1 minute.
  • Whisk until smooth, glossy, and silky.
  • Add vanilla extract.
  • The ganache gives this cake its shiny, dramatic finish.

Assemble the Final Topping

  • Once the cake has cooled for at least 20 minutes, pour the ganache over the top.
  • Allow it to drip slightly over the edges for visual appeal.
  • Sprinkle chopped chocolate candy over the surface.
  • This adds crunch, richness, and depth to the final dessert.

Notes

Refrigerate leftovers in an airtight container for up to 3 days. Reheat individual slices in the microwave for 10-15 seconds to restore the gooey texture. Freezing is not recommended, as the marshmallow layer may become grainy.