Peel, wash and chop the carrots. Peel onion and garlic, dice finely. Fry in 1 tbsp. hot oil in a pot. Steam the carrots briefly. Deglaze with 1/4 l water, stir in broth and oregano. Bring to the boil, cover and simmer for about 5 minutes. Add tomatoes and juice. Chop the tomatoes coarsely and boil them down open for another 10 minutes until thick.
Cook the pasta in boiling salted water for about 10 minutes until al dente. Drain and distribute in a lightly oiled casserole dish. Coarsely grate the feta cheese and mix half of it into the pasta
Season tomato sauce and pour over the pasta. Spread crème légère as a blob on top. Sprinkle the rest of the cheese over it. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/gas: level 3) for 25-30 minutes