Mississippi Mud Cake

Mississippi mud cake earns its name from the resemblance to the dark, gooey banks of the Mississippi River. The architecture has three distinct layers: a dense cocoa-pecan brownie cake base, a sticky white marshmallow middle, and a thick chocolate frosting top that hardens into glossy fudge.

The partially-baked cake then back-in-oven step is what creates the iconic marshmallow layer. Removing the cake at the 15-minute mark and covering with whole marshmallows, then returning for just 2 minutes, softens the marshmallows enough to spread without fully melting them. They settle into a pillowy white layer that contrasts dramatically with the dark layers above and below.

Applying the chocolate frosting immediately while the marshmallow layer is still warm is the technical move. The warmth lets the frosting glide smoothly over the sticky surface and bond into the marshmallow rather than sliding off in chunks.

Pecans folded into the batter are non-negotiable to true Mississippi style. They provide textural counterpoint to all the soft, sweet layers and tie everything to the Southern pecan-growing tradition that produced this cake.

Pro Tips

• Use mini marshmallows for even coverage. Large marshmallows leave gaps where the chocolate frosting touches the cake directly.
• Watch the cake closely at 15 minutes. It should still feel slightly soft and underbaked since the next bake completes the cooking.
• Let the cake cool completely before cutting. Cutting while warm creates a mess of melted chocolate and dragged marshmallow.
• Use a sharp knife dipped in hot water and wiped clean for the cleanest squares.

Variations

• Substitute walnuts for pecans for a different nut profile.
• Add 1 teaspoon of espresso powder to the batter to deepen the chocolate flavor.
• Use a chocolate ganache instead of typical chocolate frosting for a more glossy, candy-bar finish.