Rich Mississippi mud pie layered with chocolate, cream, and a cookie crust is an over-the-top family dessert. This indulgent Southern classic is a chocolate lover's ultimate dream.
Preheat oven to 350°F. Finely crush chocolate sandwich cookies; mix with melted butter, then press firmly into the bottom and up the sides of a 9-inch pie dish for the crust.
Bake crust for 10 minutes until set. Let cool completely at room temperature before proceeding.
In a medium saucepan over medium-low heat, melt the chocolate chips with 1 cup heavy cream, stirring constantly until smooth and glossy; remove from heat and cool slightly.
Beat cream cheese and sugar in a large bowl on medium speed until creamy, then add eggs one at a time, mixing until just blended. Stir in cocoa powder, salt, and half of the melted chocolate mixture.
Spread chocolate-cream cheese filling over cooled crust, then pour remaining chocolate mixture on top. Gently swirl with a spatula for a marbled effect.
Bake for 30–35 minutes at 325°F until the center is just set. Let cool on a rack for 1 hour, then refrigerate at least 3 hours (or overnight) for perfect texture.
Whip the remaining 1.5 cups heavy cream with vanilla extract until soft peaks form. Spread whipped cream over chilled pie before serving.