Make a fire and throw raw apples by the fire. When you see apples smoking, they are baking. Don't take too long, it will burn out.
In the volcano map, the ground temperature will be very high, and you can get baked apples by throwing them directly on the ground.
When you find an apple tree in the wild, you can stand under it with a flashlight, and the apple will automatically fall when it is ripe.
(another: baking is not recommended for ingredients. After finding the pot, you can throw the ingredients in and cook them, which is many times better than baking. )
References:
Baidu Encyclopedia-Legend of Zelda Wilderness Breath