Mix butter and sugar until fluffy

Whisk egg in another bowl

In another bowl,mix flour,baking powder and baking soda together

Add egg to the butter and sugar

Add Orange zest(the outer part of Orange) and the Orange water

Add your dry ingredients and stir gently

Use oil to grease your sandwich maker up and down

Then put in your batter base on the size of your machine

Within 3-5mins your sandwich cake is ready

Use toothpick or knife to confirm if it's done