Spray your springform pan with nonstick spray and set aside. Add the graham crackers to a large bag and crush them into tiny pieces using a rolling pin, OR place them in a food processor and blend until finely crushed.
12 Graham Cracker Sheets, Nonstick Spray
Add the melted butter to the crushed graham crackers and mix until a wet sand-like mixture forms. If using a processor, just add it straight to the mixture and blend. You may need to mix it once and then continue mixing.
7 Tablespoons Unsalted Butter
Place the mixture in the prepared pan and press it up into the bottom and almost all the way up the sides. Place in the freezer until ready to use.
Add the marshmallows to a large mixing bowl and microwave for two minutes or until the marshmallows are creamy and not lumpy when stirred.
7 Cups Mini Marshmallows
Immediately and quickly add the pumpkin puree, pumpkin spice, and salt to the melted marshmallows and stir well until fully combined.
15 Ounces Pumpkin Puree, 2 Teaspoons Pumpkin Spice, ¼ Teaspoon Salt
Add the whipped cream and then whisk well. Use a rubber spatula to fold the ingredients and then whisk again.
16 Ounces Whipped Topping
Pour into the crust and spread even with a spoon.
Refrigerate for 8 hours or until set and able to be sliced. Top with dollops of whipped cream, if desired, serve, and enjoy!