Here's a recipe for rich chocolate muffins using 10 small muffin cups from Daiso. Using melted butter makes it easy to prepare. Mix eggs, sugar, milk, and melted butter in that order, then sift in cake flour, cocoa powder, and baking powder and mix well. Fill the cups with the batter using a piping bag, top with crushed cocoa cookies and chocolate chips, and bake in the oven. They become even more moist and delicious the next day. Perfect for gifts!