Preheat the air fryer: Set it to 370°F (188°C) for 3 minutes.
A preheated basket helps the bread crisp faster.
Assemble the sandwich: Spread peanut butter on one slice and jelly on the other. Keep the layers thin and even to prevent leaks.
Seal the edges lightly: Press the slices together and run your finger or a butter knife around the edges to help keep the filling in place.
Butter the outside: Lightly butter the outer sides of the bread or spritz with cooking spray. This yields a crisp, golden finish.
Air fry: Place the sandwich in the basket.
Cook for 4–6 minutes, flipping halfway. It’s done when both sides are golden and the center feels warm.
Rest briefly: Let it sit for 1 minute. The filling is hot and will set slightly, making it easier to slice.
Slice and serve: Cut in halves or triangles.
Add a drizzle of honey or a sprinkle of cinnamon sugar if you like.