Golden fried milk cubes with crispy coating and creamy interior are a Cantonese street treat. A fun, family-friendly snack with fresh, milky flavor.
Whisk together whole milk, 4 tbsp cornstarch, sugar, salt, and vanilla extract in a saucepan until smooth.
Bring the mixture to a gentle simmer over medium-low heat, stirring constantly until it thickens into a smooth, soft dough (about 8–10 minutes).
Immediately pour the thickened milk into a parchment-lined 8-inch square pan. Smooth the surface, let cool to room temperature, then refrigerate for at least 2 hours until fully set.
Turn out the chilled milk block and cut into 1.5-inch cubes. Lightly coat each cube in the remaining 1 tbsp cornstarch.
Beat the egg in a shallow bowl. Dip each cornstarch-coated cube in egg, then press into panko breadcrumbs, coating all sides and pressing gently.
Heat vegetable oil to 340°F (medium-high). Fry the coated cubes in batches without crowding, turning occasionally until golden and crisp (about 1–2 minutes per batch).
Remove fried milk cubes with a slotted spoon and drain on paper towels. Serve warm for the creamiest texture.