Mississippi Mud Cake Recipe Southern Living: Decadent Chocolate Layers With Marshmallow Swirl

Southern dessert traditions don’t get more indulgent than this layered chocolate masterpiece. I’ve tested countless versions, and this one delivers the perfect balance of rich cocoa flavor and gooey marshmallow swirls that define authentic Mississippi mud cake.

The secret lies in a moist chocolate base topped with melted marshmallows that blend into the batter as it bakes. A final drizzle of chocolate frosting creates a glossy finish that’s as impressive as it is delicious.

This isn’t just a cake—it’s a texture experience. Every bite offers dense chocolate layers, stretchy marshmallow pockets, and a fudgy consistency that’s impossible to resist. The Southern Living touch ensures it’s both nostalgic and foolproof.

Serve it warm with vanilla ice cream or at room temperature for a dessert that disappears fast. Here’s how to make it right.

Ingredients for Mississippi Mud Cake Recipe Southern Living

Rich cocoa, gooey marshmallows, and fudgy layers make this Southern classic unforgettable.

The cocoa powder is the soul of this cake. Hershey’s Special Dark or Guittard give that deep, complex flavor Southern Living recipes are known for. Buttermilk is non-negotiable—it reacts with the baking soda for that signature tender crumb. I grab mine from Publix (their store brand is solid), but any grocery store works. The marshmallows? Jet-Puffed or Kraft miniatures melt the best without weird stabilizers.

No buttermilk? Stir 1 tbsp vinegar or lemon juice into 1 cup regular milk and let it sit 5 minutes. Dutch-process cocoa missing? Regular works, but add 1/4 tsp baking powder to compensate. Swap the semi-sweet chips for bittersweet if you want less sugar. The frosting can take half-and-half instead of milk for extra richness, but don’t skip sifting the powdered sugar (lumps ruin the glossy finish).

This cake actually tastes better the next day once the flavors meld. Store it covered at room temperature for 3 days or refrigerate for 5 days. Freeze slices (without frosting) for up to 3 months—thaw, then add fresh frosting. Pro tip: warm slices for 20 seconds before serving for that fresh-baked feel.

Step-by-Step Instructions for Mississippi Mud Cake

Here’s the method I use for perfect layers of chocolate and marshmallow every time.

Step 1: Prepare the Chocolate Cake Base

Preheat your oven to 350°F and grease a 9×13-inch baking pan. In a large bowl, whisk together the 2 cups all-purpose flour, 2 cups granulated sugar, 0.75 cup unsweetened cocoa powder, 1 tsp baking soda, and 0.5 tsp salt until fully combined.

Create a well in the center and add the 4 whole large eggs, 1 cup vegetable oil, 1 cup buttermilk, and 2 tsp vanilla extract. Beat with a hand mixer on medium speed for 2-3 minutes until the batter is smooth and glossy. Fold in 2 cups semi-sweet chocolate chips by hand to avoid overmixing.

Step 2: Bake and Add Marshmallow Layer

Pour the batter into the prepared pan and spread it evenly. Bake for 20-25 minutes until the top springs back lightly when touched and a toothpick inserted in the center comes out with a few moist crumbs.

Remove the cake from the oven and immediately sprinkle all 4 cups miniature marshmallows evenly over the hot surface. The heat will begin to soften them. Return the pan to the oven for 2-3 minutes just until the marshmallows start to puff and turn light golden brown—watch closely to prevent burning.

Step 3: Prepare the Chocolate Frosting

While the marshmallows are toasting, melt the 0.5 cup unsalted butter in a medium saucepan over low heat. Once melted, stir in the remaining 2 cups semi-sweet chocolate chips (if any were reserved) until completely smooth.

Remove from heat and whisk in the 2 cups powdered sugar and 0.25 cup whole milk until the frosting is glossy and pourable. If it’s too thick, add an additional 1-2 tablespoons whole milk to reach a spreadable consistency.

Step 4: Assemble and Set

Pour the warm chocolate frosting evenly over the marshmallow layer, using a spatula to spread it to the edges if needed. The heat from the frosting will help it meld with the marshmallows, creating that signature gooey layer.

Let the cake cool completely at room temperature for at least 2 hours before slicing. This cooling time allows the layers to set properly. For best results, I recommend chilling it in the refrigerator for 1 hour after it reaches room temperature—this makes slicing cleaner and enhances the fudgy texture.

Serving Suggestions for This mississippi mud cake recipe southern living

Warm Serve Style

I love serving this cake slightly warm with a scoop of vanilla ice cream on top. The heat softens the ice cream just enough to create a creamy contrast with the fudgy cake. Use Blue Bell Homemade Vanilla for that classic Southern touch. 💛

Cold Presentation

For a cleaner slice, chill the cake completely before serving. The layers set beautifully, making it perfect for potlucks or picnics. I often dust the top with a light sprinkle of powdered sugar for an elegant finish.

Drink Pairings

A glass of cold whole milk is the traditional choice—it balances the richness perfectly. For adults, a cup of strong black coffee cuts through the sweetness. I also enjoy it with sweet tea for a true Southern experience.

Garnish Ideas

Add a pop of color with fresh raspberries or mint leaves on top. The tartness of berries complements the chocolate beautifully. A drizzle of caramel sauce adds another layer of indulgence.

Portion Tips

Cut into 2-inch squares for standard servings. For a crowd, go smaller—1.5-inch pieces let guests enjoy a taste without overwhelming them. This cake is rich, so smaller portions are often appreciated. ✨

Make It Special

For birthdays or celebrations, add chocolate shavings or crushed pecans on top. The crunch adds wonderful texture contrast. I like to use Ghirardelli chocolate bars for shavings.

Frequently Asked Questions