Easy Spaghetti Salad recipe - cold pasta salad loaded with fresh veggies, mozzarella cheese, and Italian dressing. Made this delicious pasta salad for a potluck and everyone raved about it! Spaghetti, yellow squash, zucchini, red bell pepper, green bell pepper, red onion, tomatoes, black olives, and mozzarella tossed in Italian dressing - SO good! This is the perfect side dish for summer barbecues, potlucks, and family get-togethers.