In a medium mixing bowl, add the butter. Melt butter in microwave on half power. Add crushed Oreos and salt. Toss to moisten crumbs.
Press mixture into the bottom and up the sides of a 9-inch pie dish or a 9-inch springform pan, set aside.
In the bowl of a stand mixer or a large mixing bowl with a hand mixer, beat cream cheese until smooth, about 2 minutes. Add marshmallow fluff, salt, peppermint extract, and food coloring. Mix until combined.
In a separate mixing bowl, using a stand mixer or a hand held mixer, whip heavy cream and powdered sugar until stiff peaks form. Using a rubber spatula, fold the freshly whipped cream into the cream cheese mixture.
Genly fold the chopped Oreos into the filling. Pour into the prepared crust.
Cover with plastic wrap and chill for at least 2 hours, preferably 4 or more.
When ready to serve, make the topping. In the bowl of a stand mixer or a large mixing bowl with a hand mixer, beat the heavy cream, powdered sugar, and vanilla extract until stiff peaks form. Spread on top of chilled pie. Garnish with chopped Oreos. Serve cold.