It should be the oven temperature is too high, and because the oven is small, too close to the heating pipe is easy to bake, it is recommended to change a large oven, or not good to change the temperature measurement. When baking something with fire, if the fire is too big, resulting in too high a temperature, the surface of something has not had time to import the temperature into the object inside the object to cook, the skin can not withstand to burn. This will result in the inside not being cooked and the outside being burnt.

Expanded information:

Food overcooking

Smaller ovens are more prone to overcooking. The medium-sized oven has enough space and temperature control, so unless the oven temperature is too high, too close to the fire, or too long, it is less likely to scorch. The medium-sized oven can control the temperature, but it is still not comparable to a large professional oven.

Taking the production of Chinese and Western snacks as an example, because the medium-sized oven temperature is not as stable as a professional large oven, you have to pay more attention to the changes in the oven temperature when baking, and you have to change the side of the snacks to turn the head or lower the temperature in order to avoid the cake or the bread expanding unevenly between the two sides, or the cookies are overcooked or undercooked, and other situations occur.

Preheating the oven

Before baking any food, the oven needs to be preheated to the specified temperature in order to meet the baking time in the recipe. It takes time to preheat the oven, but if you don't do it enough, you may not reach the specified temperature. If you preheat the oven too long, it may also affect the life of the oven.

Baking height

Baking in a small oven is basically just a matter of putting the food in, but medium-sized ovens usually have three heights to choose from: upper, middle, and lower, so as long as the recipe doesn't specify upper or lower heat temperatures, you can just put the baking sheet on the middle level.

If the upper temperature is high and the lower temperature is low, unless the oven's upper and lower temperatures can be adjusted independently, it is usually better to add the upper and lower temperatures and divide by two, and then place the baking sheet on the upper level, but keep an eye on the surface to see if it is overcooked.

Reference: Baidu Encyclopedia -- Oven