Heat and get the tin ready.
Set the oven temperature to 180°C (350°F). Grease a muffin pan lightly with butter or oil, or line it with paper liners. This keeps things from sticking and guarantees uniform baking.
Combine the dry ingredients
In a large bowl, whisk together:
All-purpose flour
Sugar
Baking powder
Baking soda
Salt
Cornstarch or pudding mix
The cornflour (or custard mix) keeps the muffins wet for days and contributes to their distinctive pudding-like softness.
Mix the wet ingredients
In another bowl, whisk the eggs until smooth. Add:
Melted butter
Milk
Vanilla extract
Mix well until fully combined.
Create the base muffin batter
Using a spatula, carefully incorporate the wet ingredients into the dry mixture. A few lumps are OK; avoid overmixing. Dense muffins are the result of overmixing.
Divide the batter into two bowls
Split the batter evenly:
Bowl 1 → Vanilla batter
Bowl 2 → For chocolate batter
In Bowl 2, add:
cocoa powder
2–3 tbsp warm milk to loosen
Mix until the chocolate batter is smooth.
Layer and swirl
Fill each muffin cup with one spoon of vanilla batter and then one spoon of chocolate batter. Continue until the glasses are ¾ filled.
To achieve a marbled look, gently swirl the two batters using a toothpick or skewer. Avoid swirling too much; two to three circular movements will do.
Add toppings (optional but recommended)
For a café-style finish, add coloured sprinkles or chocolate chips on top. This gives them the appearance of traditional Pēito sweets.
Bake
A toothpick inserted in the centre should come out clean after 18 to 22 minutes of baking; the tops should be lightly brown and bounce back when pressed.
Cool and serve
After letting the muffins cool in the pan for ten minutes, move them to a wire rack. The next day, when the custard texture settles, they taste even better.