Cook the pasta in boiling salted water for about 8 minutes. Then drain well. Peel and finely chop the onion. Dice the bacon as well. Roast sunflower seeds in a pan without fat.
Take out. Leave the bacon in the pan until crispy. Add onion and fry until transparent. Clean, wash and slice the tomatoes. Put pasta, bacon mixture, tomato slices and sunflower seeds into a greased ovenproof dish. Whisk milk and eggs. Season with salt and pepper and pour over. Sprinkle with cheese. Put butter in flakes on top.
Whisk milk and eggs. Season with salt and pepper and pour over. Sprinkle with cheese. Put butter in flakes on top. Bake in the preheated oven (electric: 200°C/ gas: level 3) for about 45 minutes. Garnish with basil to taste