Moon cakes with sweet red bean paste filling are a beloved Mid-Autumn Festival treat. A family dessert with naturally sweet, earthy flavor.
Prepare the dough by mixing all-purpose flour, baking soda, and salt in a bowl. In a separate bowl, combine golden syrup, vegetable oil, and egg yolk, then blend into the dry ingredients until a smooth dough forms.
Cover the dough and let it rest at room temperature for at least 45 minutes; this step helps the texture soften for easier molding.
Divide the rested dough into 8 portions. Flatten each portion carefully and wrap around 2 tbsp of red bean paste, sealing well. Roll gently to form balls.
Preheat oven to 350°F (175°C). Lightly grease a baking sheet or line it with parchment. Place shaped moon cakes onto the sheet and use a moon cake mold to press each one, if desired.
Whisk the whole egg to make an egg wash. Brush the tops of the moon cakes lightly. Bake on the middle rack for 10 minutes, remove, let cool for 10 minutes, then brush again and return to the oven for 12-15 more minutes until golden brown.
Cool moon cakes completely on a rack to allow the crust to soften and flavors to meld. For best texture, store in an airtight container for 1–2 days before serving.