1. Ingredients: 300ml milk, 50g flour, 20g fine sugar, 3 eggs.

2. Take 20g of white sugar, 50g of flour, use a measuring cup to measure 300ml of fresh milk, mix and stir; then separate the yolks from two eggs and stir the yolks.

3. Mix the beaten egg yolks with the previous milk, flour and sugar together and continue to stir.

4. After stirring, sift twice.

5. The sifted liquid is a bit beige, pour it into the pot and heat it over low heat.

6. Stir while heating. Stir until the batter is a little clingy and there is no need to heat it any more.

7. Pour the heated batter into the mold. I made the amount for one person, so I found two small square crisper boxes and put them in the refrigerator for half an hour.

8. Take it out from the refrigerator and preheat the air fryer for 5 minutes. Here, take the egg you just saved, beat the yolk, and brush a layer of egg wash on the outer surface of the small square to bake.

9. Air fryer at 180° for 5 minutes. It will feel a little puffy just after baking.

10. It will become a little deflated after it slowly cools down.

11. The inside has a texture that trembles when touched, and the outer skin is thin and a bit chewy.

12. Take a sip and your mouth will be filled with the fragrance of custard. By the way, if you are not afraid of getting tired, you can add some grated cheese on top after brushing with egg wash when baking.