Peel and wash the carrots and potatoes. Halve carrots lengthwise and cut into pieces, cut potatoes in half. Spread on the fat pan of the oven, drizzle with 2 tablespoons of olive oil.
Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 15 minutes. Wash and clean the zucchini, cut in half lengthwise and cut into pieces. Quarter the peppers, clean, wash and cut into pieces.
Clean the mushrooms, possibly wash and halve them. Wash the rosemary, dab dry and pluck. Peel garlic and cut in half. Add the vegetables and rosemary to the potatoes, spread them out and drizzle with 3 tablespoons of oil.
Season everything with salt and pepper. Increase the oven temperature (electric oven: 200 °C/ convection oven: 175 °C/ gas: level 3) and bake everything else for another 15-20 minutes. Turn from time to time. Add broth 10 minutes before the end of the baking time.
Keep vegetables warm, pour stock through a sieve into a pot. Add wine, simmer for 5 minutes. Add cream, stir in sauce thickener, let simmer for 1 minute. Wash parsley, dab dry and chop finely.
Stir into the sauce. Season to taste with salt and pepper. Serve the sauce with the vegetables.