In a mixing bowl, combine cornstarch, sugar, and salt.
Add oil and mix well.
Gradually add water to form a thick batter.
Fold in butter until evenly distributed.
Gently stir in milk and vanilla essence.
Let the mixture rest for about 10 minutes before cooking.
Heat a non-stick pan over medium heat and pour spoonfuls of the batter onto it.
Cook until bubbles appear on the surface, then flip and cook the other side until golden brown.
Serve hot.