Sprinkle the packet of unflavored gelatin over the water and let it sit for about 2 minutes. Give it a little stir to help combine all the gelatin if needed.
Using a stand mixer, add the prepared gelatin, vanilla extract, and liquid allulose to the bowl.
Add the whisk attachment.
Turn on the mixer to level 2 (slow) until the whisk begins to move.
Once the mixture has begun to move, turn the mixer speed all the way up to level 10. I used the splash guard on my mixer but you may not need to if your bowl is deep enough.
Set a timer for exactly 20 minutes. You will see the liquid start to get texture at the 10-minute mark but to make it extra fluffy go the full 20 minutes.
Notes
Note: 1 Knox gelatin packet or pouch is about 2 1/2 teaspoons (7g) unflavoured gelatineKeto Marshmallow Recipe Notes: This keto marshmallow fluff will hold up at room temperature for many hours. I've tested 3 hours before putting it in my refrigerator. This means that it will go nicely on top of a cake if you wanted but I haven't tested this recipe outside only at room temperature inside my house (meaning I'm not sure how it will hold up if you topped a cake with this fluff and brought it to a park for a party.)
This fluff recipe holds up nicely for 2 days in the refrigerator!
This fluff recipe can be torched to turn into a toasted marshmallow topping too! This is exciting!!