1. Use an electric whisk to mix the softened butter and powdered sugar evenly.
2. Add the egg white at room temperature in portions and mix well.
3. Sift in low-gluten flour and form a dough.
4. Roll the dough into 2-3 mm thick slices. Use a cutting die to press out the round cake dough on the dough, and then place it in the baking pan.
5. After peeling the oranges, cut them into 2-3 mm slices.
6. Brush the cake base with a thin layer of egg white, then put the orange slices on it and press lightly.
7. Put it in the preheated oven, heat up and down at 165 degrees, and bake the middle and lower layers for about 25 minutes.
8. After being baked to cool, you can sprinkle a layer of powdered sugar on the surface of the cookies for decoration.
