Brush the tops of your frozen Uncrustables with the melted butter (optional) to make the Uncrustables a little less dry.
Place them in the air fryer basket, leaving space around them for the air to circulate. Turn the air fryer to 350 degrees F and cook them for 6-8 minutes, flipping them halfway through cooking.
Notes
Brush the tops with butter so the tops crisp while the centers stay soft. This step is optional, but it helps keep the Uncrustables moist while adding warmth and color, so I never skip it!
Leave a bit of space between each sandwich in the air fryer basket so the hot air can circulate properly. Work in batches rather than overcrowding the basket.
Flip halfway through cooking so both sides end up golden.
If adding cinnamon or powdered sugar, sprinkle them on right when the Uncrustables come out of the air fryer so they fuse with the hot surface.
This nutrition information is based on the exact products I used in this recipe. Brands and sizes of products could alter exact nutrition and should always be calculated independently.