Crush Oreos into crumbs, keeping the filling. Mix with melted 3/4 cup of butter and press into a greased 9x13 pan. Bake for 8 minutes.
Mix 1/2 cup cocoa and 1 cup melted butter. Let cool slightly.
Beat 4 eggs, then whisk in 1 and 3/4 cups sugar, salt, and vanilla.
Add 1 and 1/2 cups flour and 2 cups pecans. Mix well.
Pour the cocoa-butter mixture over the crust, then spread the batter over it.
Bake at 350°F for about 40 minutes. In the last 5 minutes, sprinkle on 3 cups of mini marshmallows.
For the frosting, whisk together 4 cups powdered sugar, 1/3 cup cocoa, 2/3 cup evaporated milk, and 1/2 cup melted butter. Spread over the cooled pie.
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