Bánh Quy Trứng Muối - Salted Egg Yolk Cookies
all-purpose flour (about 190 grams) • salted egg yolks • baking powder • powdered sugar (about 60 grams) • unsalted butter, softened at room temperature (about 120 grams) • Black sesame seeds, egg yolk, 1 teaspoon milk (about 5 ml)