Mini vanilla cake without oven-cake recipe-how to make mini vanilla cake on gas/in utensil or wok

Ingredients:
6 tbsp flour 50g,
2 tbsp oil 19g,
2 tbsp sugar 24g granulated,
1 egg,
1/2 tsp baking powder 2g,
Water 1tbsp 14 g,
Vanilla/lemon essence 1/2 tsp 2g,
Salt 1/4 tsp 2g.

For butter icing/frosting:
63g butter,
94 g icing sugar,
7 ml milk.