01 -
Using a food processor, process the Oreos into fine crumbs. Add melted unsalted butter and pulse until fully combined. Press the mixture into the bottom and sides of a 9-inch pie plate using a spatula or the bottom of a measuring cup, then smooth and level. Place the pie plate in the freezer for 30 minutes to 1 hour to firm up.
02 -
Soften marshmallow creme in a large microwaveable bowl by heating it at full power for no more than 45 seconds. If using large marshmallows, melt them in a saucepan over medium heat, stirring frequently, then let cool completely.
03 -
In a medium mixing bowl, use a hand mixer or a stand mixer fitted with the whisk attachment to beat the heavy whipping cream until it forms whipped cream, about 4 minutes.
04 -
Combine softened marshmallow creme and crème de menthe in a large bowl, mixing until well blended. Gently fold in the whipped cream until fully incorporated.
05 -
Pour the mint pie filling mixture into the chilled Oreo crust. Top with additional Oreo crumbs, then chill in the freezer for 5-6 hours or overnight. Before serving, let the pie sit at room temperature for 10-15 minutes.