How to make:

1. Beat the egg, granulated sugar, and palm sugar until fluffy.
2. Add the chocolate milk and mix until well combined.
3. Sift together the flour, cocoa powder, and baking powder, then add to the mixture.
4. Turn off the mixer, then fold in the melted butter, cooking oil, and chopped chocolate bar until well combined.
5. Transfer the batter into a piping bag.
6. Place the batter into muffin cups and sprinkle choco chips on top.
7. Bake in a preheated oven at 150°C (302°F) for 30 minutes.

Yields 5 muffins.