Peel the potatoes, cut in half, cut into slices and cook in salted water for about 5 minutes. Sauté the frozen vegetables in a little vegetable stock until crisp. First place the potatoes in a flat baking dish, spread the vegetables over the top.
Fill up the liquid from the vegetables a little with water, mix approx. 100 ml milk and a tablespoon of flour and add. Bring to the boil while stirring. Pour in enough milk to make a creamy sauce (approx. 500 ml). Season with salt, pepper, chives and parsley and pour over the vegetables. Finally, sprinkle with the grated cheese.
Baked in a preheated oven at 225 ° C for about 20-25 minutes.