Heat 3/4 cup unsweetened milk (200 ml) with 3 tablespoons sweetened condensed milk until it just starts to steam, then remove from heat.

Separate 3 eggs, using only the yolks, and use 1 whole egg (with both yolk and white). Add 3 tablespoons sugar. Gradually pour this mixture into the milk mixture while mixing with a hand mixer until smooth. Strain the mixture to ensure a silky texture when steaming.

Pour the mixture into molds. Using an air fryer, cook for 30 minutes at 250°F (120°C). Avoid higher temperatures to prevent burning or a rough texture.