Step 1: Prepare the Crust

1. Preheat your oven to 350°F (175°C).
2. Combine graham cracker crumbs, sugar, and melted butter in a bowl. Mix until the crumbs are well-coated.
3. Press the mixture into a 9-inch pie dish, ensuring an even layer on the bottom and sides.
4. Bake the crust for 10 minutes. Remove from the oven and let it cool completely.

Step 2: Make the Filling

1. Melt dark chocolate chips and 2 tablespoons of butter in a heatproof bowl set over a pot of simmering water. Stir until smooth.
2. Spread the melted chocolate mixture over the cooled crust. Refrigerate for 10 minutes to set.
3. Arrange sliced strawberries evenly over the chocolate layer.
4. In a separate bowl, whisk heavy cream until stiff peaks form.
5. Fold marshmallow fluff into the whipped cream until well combined.
6. Spread the marshmallow mixture over the strawberries, smoothing the top with a spatula.

Step 3: Add the Topping

1. Chill the pie in the refrigerator for at least 2 hours, allowing the flavors to meld together.
2. Before serving, top with whipped cream, fresh strawberries, and chocolate shavings.