Cook the pasta in plenty of boiling salted water for 8-9 minutes. Pour onto a sieve, rinse under cold water and drain. Defrost peas, drain corn. Clean, wash and dice the peppers. Dice the sausage as well. Peel and chop onion. Mix yoghurt, mayonnaise, ketchup and onion.
Season with vinegar, salt and pepper. Mix noodles, vegetables and sauce and let it soak a little. Wash the chives, dab dry and cut into small rolls. Crisp out the bacon in a pan, drain on kitchen paper and let it cool down. Crumble the bacon. Season pasta salad with salt, pepper and vinegar and serve sprinkled with chives, bacon and cheese