Mississippi mud pie is a deeply American dessert: a crumbly chocolate cookie crust piled high with a dense, fudgy brownie-like filling and topped with a glossy chocolate ganache. This version, inspired by the techniques popularized by America’s Test Kitchen, focuses on maximizing chocolate intensity while keeping the texture perfectly dense and scoopable. It works because it uses a combination of melted chocolate and cocoa powder for a deep, complex flavor, and a hot water bath in the filling that ensures a silky, crack-free top.
Ingredients
- For the crust:
- 1 1/2 cups (170 g) chocolate wafer cookies (about 30 cookies), finely ground
- 6 tablespoons (85 g) unsalted butter, melted
- 2 tablespoons (25 g) granulated sugar
- 1/4 teaspoon salt
- For the filling:
- 1/2 cup (120 ml) hot water
- 1/4 cup (25 g) Dutch-processed cocoa powder
- 4 ounces (115 g) bittersweet chocolate (60-70% cacao), chopped
- 1/2 cup (115 g) unsalted butter, cut into 8 pieces
- 1 1/4 cups (250 g) granulated sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- 1/2 teaspoon salt
- 3/4 cup (95 g) all-purpose flour
- For the ganache topping:
- 6 ounces (170 g) bittersweet chocolate (60-70% cacao), chopped
- 3/4 cup (180 ml) heavy cream
- 2 tablespoons (30 ml) light corn syrup (optional, for shine)
Instructions
- Preheat the oven to 350°F (175°C). Lightly grease a 9-inch (23 cm) springform pan or a deep-dish pie pan.
- In a medium bowl, combine the ground chocolate wafer cookies, melted butter, sugar, and salt. Press the mixture firmly into the bottom and up the sides of the prepared pan. Use the bottom of a flat measuring cup to compact it evenly. Bake for 10 minutes, then set aside to cool slightly while you make the filling. Reduce the oven temperature to 325°F (165°C).
- In a small bowl, whisk the hot water and cocoa powder together until smooth. Set aside.
- In a medium heatproof bowl set over a pot of barely simmering water (or in the microwave in 30-second bursts), melt the chopped chocolate and butter together, stirring frequently until completely smooth. Remove from heat.
- Whisk the sugar into the chocolate-butter mixture until fully incorporated. Add the eggs one at a time, whisking vigorously after each addition until the mixture is glossy and thick. Stir in the vanilla and salt.
- Gently whisk in the cocoa-water mixture until fully combined. The batter will be thin and shiny.
- Sprinkle the flour over the batter and fold with a rubber spatula until just a few streaks of flour remain. Do not overmix.
- Pour the filling into the pre-baked crust. Smooth the top with an offset spatula.
- Bake at 325°F (165°C) until the edges are set and the center is just slightly jiggly, about 45-55 minutes. A toothpick inserted 2 inches from the edge should come out with a few moist crumbs, but the center will still look underdone. This is correct—the pie will continue to set as it cools.
- Let the pie cool completely on a wire rack, about 1 hour. Then refrigerate for at least 2 hours, or until fully chilled and firm.
- For the ganache: place the chopped chocolate in a medium heatproof bowl. Heat the cream and corn syrup (if using) in a small saucepan over medium heat until it just begins to simmer. Pour the hot cream over the chocolate and let it sit for 2 minutes. Gently stir until smooth and glossy.
- Pour the ganache over the chilled pie, spreading it to the edges with an offset spatula. Refrigerate for at least 30 minutes to set the ganache before serving.
- To serve, run a thin knife around the edge of the pan, release the springform, and slice with a sharp knife dipped in hot water and wiped dry between cuts.
Tips
- Use Dutch-processed cocoa: Dutch-processed cocoa is alkalized, which gives a deeper, less acidic chocolate flavor and a darker color. If you only have natural cocoa powder, you can substitute it, but the flavor will be slightly more bitter and the texture a bit less tender.
- Don’t overbake: The center of the pie should look slightly underbaked when you pull it out of the oven. It will continue to set as it cools, resulting in a dense, fudgy texture rather than a cakey one. Overbaking will make it dry.
- Chill thoroughly: This pie needs at least 2 hours in the refrigerator to fully set. If you slice it too early, it will fall apart. For cleanest slices, chill for 4 hours or overnight.
- Use a springform pan: A springform pan makes removing the pie much easier. If using a regular pie dish, you’ll need to serve it directly from the dish, and the crust may stick more.
Serving Suggestions
Serve this pie cold, straight from the refrigerator, or at room temperature for about 15 minutes to soften slightly. A dollop of lightly sweetened whipped cream or a scoop of vanilla ice cream is the classic accompaniment—the cool creaminess balances the intense chocolate. For a touch of contrast, add a few fresh raspberries or a sprinkle of flaky sea salt on top.
Variations
- Peanut Butter Swirl: Warm 1/2 cup (130 g) creamy peanut butter in the microwave for 30 seconds, then dollop it over the filling before baking and swirl with a knife.
- Bourbon-Infused: Add 2 tablespoons (30 ml) bourbon to the filling along with the vanilla. This adds a warm, smoky note that pairs beautifully with chocolate.
- Mint Chocolate: Add 1/2 teaspoon peppermint extract to the filling and top the finished pie with crushed peppermint candies.
- No-Bake Crust: If you’re short on time, use a store-bought chocolate cookie crust and skip the baking step for the crust. Just press it into the pan and proceed with the filling.
Storage and Reheating
Store leftover Mississippi mud pie in the refrigerator, covered tightly with plastic wrap or in an airtight container, for up to 4 days. The pie is best served cold, so you don’t need to reheat it. If you prefer it slightly warm, microwave individual slices for 10-15 seconds, but be aware the ganache may become sticky. To freeze, wrap the entire pie (or individual slices) in plastic wrap and then foil, and freeze for up to 2 months. Thaw overnight in the refrigerator before serving.
Frequently Asked Questions
Can I use milk chocolate instead of bittersweet? Yes, but the pie will be significantly sweeter and less intensely chocolatey. If you use milk chocolate, reduce the sugar in the filling to 1 cup (200 g) to compensate.
Why is my pie cracked on top? Cracks usually happen when the pie is overbaked or the oven temperature is too high. The hot water in the filling helps prevent cracking, but make sure you pull it out while the center is still slightly jiggly. Also, cooling it gradually on a rack rather than in a drafty spot helps.
Can I make this pie gluten-free? Yes, substitute the all-purpose flour with a 1:1 gluten-free baking flour blend. Also, ensure your chocolate wafer cookies are gluten-free (many are not—check the label) or use gluten-free graham crackers mixed with cocoa powder.
Do I need to refrigerate the pie after it’s fully set? Yes, because the ganache topping contains cream, it should be kept refrigerated. The pie can sit out at room temperature for up to 2 hours during serving, but any longer and the ganache may soften too much.
Can I make this in a regular pie dish instead of a springform? Absolutely. Use a 9-inch (23 cm) deep-dish pie plate. You won’t be able to remove the pie cleanly, but you can cut and serve directly from the dish. Just be sure to press the crust up the sides evenly.
What does the corn syrup do in the ganache? Corn syrup adds shine and a slightly softer, more pliable texture to the ganache. It’s optional—if you skip it, the ganache will be a bit more matte and firmer, but still delicious.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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