Clean, wash and cut the peppers into large pieces. Wash and clean the zucchini and also cut them into large pieces. Peel and slice the onions. Mix oil, herbs, garlic cloves with skin and prepared vegetables.
Season with salt and pepper. Spread on the fat pan of the oven or in a large flat roasting pan. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 15-20 minutes.
Serve with chilli quark and ciabatta bread.