Savory egg custard tarts with a silky, seasoned custard in flaky pastry are a unique dim sum treat. A protein-rich, family-friendly snack.
Preheat your oven to 375°F, adjusting the rack to the lower third for even bottom heat.
Thaw and roll out the frozen puff pastry sheet on a lightly floured surface; cut into 6 rounds and press into a standard muffin tin, trimming excess edges.
In a medium bowl, whisk together eggs, milk, half-and-half, soy sauce, salt, white pepper, and sesame oil until the custard is smooth and fully blended.
Scatter scallions and shredded cheese evenly into the pastry shells, then gently pour in the custard mixture, filling nearly to the top.
Bake for 22–26 minutes until the custard is set but still slightly wobbly in the center and the pastry is deeply golden; cool in the tin for 5 minutes before removing.