Make this rich, layered Mississippi Mud Pie featuring a chocolate cookie crust, fudgy filling, and whipped topping. It is a satisfying, make-ahead dessert.
Prepare the crust: Mix the chocolate cookie crumbs and melted butter. Press the mixture firmly into the bottom and up the sides of a 9-inch pie plate. Chill the crust for 15 minutes.
Make the chocolate filling base: In a medium bowl, whisk together the instant chocolate pudding mix and cold milk until thickened, about 2 minutes. Gently fold in half of the thawed whipped topping. Spread this mixture evenly over the chilled crust.
Prepare the fudgy layer: In a small saucepan, combine the chopped chocolate, granulated sugar, eggs, and vanilla extract. Cook over medium-low heat, stirring constantly, until the chocolate is melted and the mixture thickens slightly, about 5 to 7 minutes. Do not let it boil.
Assemble the pie: Pour the warm fudgy chocolate mixture over the pudding layer. Smooth the top.
Chill the pie: Cover the pie loosely with plastic wrap and refrigerate for at least 4 hours, or until the filling is firm.
Top and serve: Before serving, spread the remaining half of the whipped topping over the chilled pie. Garnish with chocolate shavings or cookie crumbles if desired. Slice and serve cold.
Notes
You can use a graham cracker crust instead of a chocolate cookie crust for a different texture.
This pie tastes best when made the day before serving, allowing the layers to set completely.
For a richer flavor, use dark chocolate instead of semi-sweet in the fudgy layer.