Cut the whole wheat bread into 4 pieces and roll them out thin with a rolling pin.
Lightly oil a paper cup, then place two pieces of bread inside each cup.
Filling: Mix 2 spoons (about 50g) of Greek yogurt, 2 spoons of allulose, 1 room temperature egg, and 4-5 drops of vanilla oil (optional) until well combined.
Pour the filling into the paper cups.
Cook in an air fryer at 160°C for 10 minutes, then 180°C for 3 minutes.