Peel onions and garlic. Finely chop the garlic. Cut onions into slices. Clean, wash and chop the zucchini. Quarter peppers, remove seeds, wash and cut into pieces.
Wash, clean and slice the tomatoes. Cook the pasta in plenty of boiling salted water for about 10 minutes. In the meantime heat oil in a pan. Fry onions and garlic for about 5 minutes.
Add the zucchini, peppers and tomatoes and fry briefly. Deglaze with vegetable stock and bring to the boil. Stir in cream cheese and tomato paste and cook over medium heat for about 5 minutes. Season with salt, pepper and herbs.
Stir starch with 1 tablespoon of water until smooth, thicken sauce with it. Bring to the boil again and cook for about 2 minutes. In the meantime drain the noodles and let them drain. Arrange noodles and sauce on plates and garnish with thyme leaves.