Pre-heat Air Fryer at 300F. Set to 8 minutes.
In a shallow large bowl, vigorously beat egg yolk until smooth. Simply use a fork, a whisk, or an egg beater.
Pour heavy cream. Mix well until creamy.
Add vanilla, cinnamon, and nutmeg. Continue to blend the ingredients until well-combined.
Gently place half slice of brioche into the mixture. Soak each side of the bread for about 5 to 8 seconds.
Transfer each half slice of brioche to the Air Fryer tray. When you’re using an Air Fryer tray, always prepare another tray at the bottom to avoid any mess.
Insert Air Fryer tray into the Air Fryer. Use the middle cooking chamber, near the rotisserie catch.
Turn slices of bread at the last 3 or 4 minutes.
Carefully remove Air Fryer tray when the timer ends.
Allow to cool for a minute then transfer to a serving plate.
Dust with confectioner’s sugar and drizzle with maple syrup. Add some fresh berries, if desired.
Serve immediately and enjoy every forkful.