계란빵 - Egg bread Gyeran-ppang
https://www.maangchi.com/recipe/gyeran-ppang Ingredients Makes 3 gyeran-ppang 1 tablespoon unsalted butter, melted (14g) 3 tablespoons sugar (37,5g) a pinch of salt 1 teaspoon baking powder ½ teaspoon vanilla extract ½ cup all purpose flour (68g) ½ cup milk (113g) 4 eggs 1 teaspoon cooking oil 1 stick of mozzarella cheese (optional), cut into 6 equal-sized small pieces if used.