Preheat oven to 350 degrees F. Line an 8 inch springform pan with parchment paper and set aside.
Into a food processor, place the pumpkin puree, cottage cheese, collagen, egg yolks and vanilla. Puree until very smooth.
In a large bowl, place the egg whites and allulose. Use a hand mixer to mix until stiff peaks form.
Gently fold the pumpkin mixture into the whites, trying to keep the whites formed.
Transfer the mixture into the prepared springform pan and bake for 45-50 minutes or until cooked through and a toothpick inserted into the center comes out clean.
Allow to cool before slicing and serve with whipped cream if desired!
Store extras in an airtight container in the fridge for up to 7 days. Can be frozen for up to a month.