For the pasta salad, cook the pasta in plenty of salted water until al dente and let cool. One by one, cut peppers and then zucchini into bite-sized pieces. Cut mushrooms into quarters.
Sauté vegetables one by one in olive oil until brown. Put everything in a large bowl, mix well. Season with plenty of balsamic vinegar, a little oil (the vegetables are already quite oily after sautéing) and salt (pepper if desired).