In a large mixing bowl, beat the room temperature cream cheese with an electric stand mixer on high speed until it becomes creamy and smooth.
Add the pumpkin puree, maple syrup (or monk fruit for a low-carb version), vanilla extract, pumpkin pie spice, and cinnamon to the cream cheese. Continue to beat until all the ingredients are well combined and the mixture is smooth.
If you're using whipped cream, fold it gently into the pumpkin mixture until fully incorporated. For a lighter option, use Cool Whip and gently fold it in.
In a separate bowl, whip the heavy cream until stiff peaks form. If you prefer a lower-fat option, you can use Greek yogurt instead of heavy cream. It will still provide a creamy and fluffy texture.
Gently fold the whipped heavy whipping cream (or Greek yogurt) into the pumpkin mixture. This will give your mousse a super light and airy dessert texture.
In a food processor, pulse the gluten-free graham crackers into fine crumbs. Alternatively, you can place them in a plastic bag and crush them using a rolling pin.
Melt some butter and mix it with the graham cracker crumbs. This will create a buttery graham cracker crust for your mousse.
Take serving glasses, shot glasses, or mini pumpkins for a festive touch, and layer the bottom with the graham cracker crust mixture.
Carefully pipe using a pastry bag or spoon the pumpkin cheesecake mousse on top of the graham cracker crust in each glass.
Finish off with a sprinkle of pumpkin spice for garnish.
Refrigerate your pumpkin cheesecake mousse for at least 2 hours or until it sets.
Serve chilled as a perfect dessert for Thanksgiving dinner or any time of year when you're craving those fall flavors.