cook the dish in the oven at 180° for 35-40 minutes. If you want to get more porridge, then increase the cooking time by 5-7 minutes.
I do not cook such buckwheat specially (why drive the oven!), but combine it with baking bread, for example, or pies, or baking meat, and put it on the free level of the oven. Convenient! The oven is fully occupied and you end up with two ready-made dishes.
Remove the mold from the oven, carefully (do not burn yourself with steam!) cut the package. Everything is ready! You can serve it. By the way, when buckwheat with vegetables cools down, it becomes no less delicious.