Sponge cake milk dancow only with 1 egg! without mixer, tasty and easy

Hello everyone this time I made Dancow milk steamed sponge only 1 egg without mixer, it tastes really good and soft

Materials :
1 egg
3 tablespoons granulated sugar
1/2 tsp emulsifier sp
6 tablespoons flour
1 sachet/27 gr of Dancow milk powder
1/2 teaspoon baking powder
8 tablespoons liquid milk
3 tablespoons of vegetable oil

Filling material
1 tablespoon cornstarch
1 tablespoon sugar
100 ml of liquid milk

Sprinkling ingredients
Grated cheese to taste