Preheat air fryer to 300 degrees.
Mix cornstarch and cold water together and set aside.
Combine pumpkin purée, oil, cornstarch slurry (stir before mixing in), milk, spices, and vanilla. Mix well.
Add the Truvia brown sugar blend and mix.
Gradually add the Kodiak Cakes mix. Whisk until well combined. The batter should be thick
Use silicone cupcake/muffin cups and divide batter evenly in the cups
Place cups carefully one-by-one (if you have single muffin cups) into the preheated air fryer basket.
Air fry at 300 degrees for about 10 minutes.