Preheat your oven to 350°F (175°C). Grease a 9x13 inch (23x33 cm) baking dish with butter or oil.
In a large bowl, combine the all-purpose flour, sugar, and baking powder. Mix well.
In a separate bowl, beat the eggs and add the melted butter, coconut milk, vanilla extract, and salt. Mix until well combined.
Gradually add the wet ingredients to the dry ingredients, stirring continuously until you have a smooth batter.
Pour the batter into the greased baking dish, spreading it evenly.
Bake in the preheated oven for about 40-45 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Remove the bibinka from the oven and let it cool in the baking dish for about 10-15 minutes.
Cut into squares and serve warm or at room temperature.
Enjoy your meal!