Use an old bottle at home to make this easy and delicious snack

Use an old bottle at home to make this easy and delicious snack

Dough :
1 egg (total weight including shell 60 gram
50 grams sugar
1/4 teaspoon salt
1/2 teaspoon vanilla
20 grams butter
180 grams glutinous flour
100 grams rice flour
140 ml liquid coconut milk

Chocolate Sauce :
125 ml milk
60 grams chocolate
1/2 tablespoon cornstarch
10 ml water
5 grams butter