Clean broccoli, wash it, cut it into florets. Steam in boiling salted water for 3-4 minutes. Quench and drain well
Wash the basil, remove the leaves. Clean and wash the tomatoes, eggplant and oyster mushrooms. Cut the aubergine in half lengthwise and slice it
Fry the aubergine in 4 tablespoons of hot oil on each side until golden brown. Season with salt and pepper, remove
Fry the oyster mushrooms in 2 tablespoons of hot oil. Add the tomatoes and fry briefly. Season everything with basil, salt and pepper. Cut mozzarella into slices. Grate Gouda
Pour the vegetables into a large greased casserole dish. Spread mozzarella and gouda cheese on top. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for 15-20 minutes