Cookie cake is small, 20L is ok, but toast is better than 25L, and if it is for home use, I suggest it is above 25L. Cooking in the oven does not mean that it can be baked well. The oven is too small. After the food is put in, it is difficult to control the temperature and time because of the small space, too close to the heating pipe and uneven heating, especially the fat meat like toast, which is easy to burn on the surface. It is conceivable that when the toast is put in, it is only a few centimeters away from the heating tube. If baked for a long time, even if the surface is covered with tin foil to prevent excessive coloring, the bottom will be burnt.