Rinse the sago pearls under cold water until the water runs clear. Soak the pearls in 3 cups of water for 30 minutes, then drain.

In a mixing bowl, combine the drained sago pearls, coconut milk, sugar, salt, and vanilla extract (if using). Mix until well combined.

Preheat the air fryer to 350°F (175°C) for 5 minutes.

Lightly spray the air fryer basket with cooking spray to prevent sticking.

Spoon the sago mixture into small, greased ramekins or silicone molds, filling each about 2/3 full.

Place the ramekins in the air fryer basket in a single layer. Cook for 15 minutes at 350°F (175°C) or until the sago is translucent and set.

Carefully remove the ramekins from the air fryer and let them cool for a few minutes before serving.