Fry the zucchini and carrots in butter for five minutes, add the green onions and continue to fry for another two minutes. Preheat the oven to 200 degrees. Vegetables, cheese and buckwheat are visually divided into 3 parts. At the bottom of the baking dish, put one part of buckwheat, then fried vegetables and cheese. Repeat the layers in the same order two more times.