Mix glutinous rice flour, sugar, and salt in a large bowl.
In a separate bowl, dissolve cocoa powder in milk to make cocoa milk.
Gradually add the cocoa milk to the large bowl and mix until the dough becomes crumbly.
Sift the dough for a smoother texture.
Line a steamer with cloth and flatten the dough on top.
Gently press and evenly sprinkle chocolate chips over the dough.
Steam for 20–25 minutes until cooked.
Let the finished choco seolgi cool before serving.