• Step 1: Cook the pasta according to package instructions, then drain and rinse with cold water to cool completely.
• Step 2: In a large bowl, combine the cooked and cooled pasta, diced bell peppers, halved cherry tomatoes, diced red onion, sliced black olives, diced cucumber, and grated Parmesan cheese. If using, also add the sliced pepperoncini.
• Step 3: In a separate bowl, whisk together the mayonnaise, white vinegar, dried oregano, and garlic powder. Season with salt and pepper to taste.
• Step 4: Pour the dressing over the pasta and vegetable mixture and stir gently until everything is evenly coated.
• Step 5: Cover the bowl and refrigerate the Salad Supreme Pasta Salad for at least 30 minutes, or up to 3 days, to allow the flavors to meld.