Ăn vặt - Nama chocolate dẻo dẻo bằng sữa đặc và bột cacao
sweetened condensed milk • (100-200 grams) unsweetened cocoa powder, sifted for smoothness • little vanilla powder (optional, I don't use it) • Plastic container/mold, or anything that can shape into a square • Plastic wrap • Butter/cooking oil, just a little to prevent sticking, but it's optional