Combine the Base: In a large mixing bowl, add 1 can (15 oz) pumpkin puree, 1 package (3.4 oz) instant vanilla pudding mix, 1 tsp pumpkin pie spice, ½ tsp cinnamon, ¼ tsp nutmeg, and 1 tsp vanilla extract. Use a whisk to mix these ingredients thoroughly until well combined.
Incorporate Whipped Topping: Once the pumpkin mixture is smooth, gently fold in 1 container (8 oz) whipped topping using a spatula. Be careful not to deflate the whipped topping; this will ensure your fluff remains light and airy.
Add Sweetness: If desired, fold in 1 cup mini marshmallows for extra sweetness and texture. This step is optional, but it can enhance the fluff’s flavor profile.
Chill for Flavor: After everything is mixed, cover the bowl with plastic wrap or transfer the fluff to a serving dish. Chill in the refrigerator for at least 1 hour to allow the flavors to meld and the texture to set.
Serve and Enjoy: Once chilled, serve your pumpkin fluff with graham crackers or gingersnap cookies on the side for dipping. Enjoy the creamy, spiced treat with family and friends!