In a bowl, combine the flour and baking powder. Set aside.

In a separate bowl, beat the eggs and sugar until the sugar is completely dissolved.

Incorporate Wet Ingredients: Add the milk and vanilla/orange essence to the egg mixture, blending until smooth.

Gradually add the vegetable oil to the mixture, mixing slowly until it's well incorporated.

Combine with Dry Ingredients: Gently fold in the flour mixture and salt, mixing until just combined. Let the batter rest for 15 minutes.

Bake: Pour the batter into the prepared pan and bake for approximately 20 minutes, or until a toothpick inserted into the center comes out clean.

Allow the cake to cool for a few minutes before serving. Then, savor your delicious homemade butter cake!