Homemade 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