1 (16 ounce) package tri-color rotini pasta
1 small red onion
diced
1 cup diced roasted red peppers
1 cup cubed mozzarella cheese
1 (6 ounce) jar marinated artichoke hearts
drained and chopped
¼ pound salami
diced
¾ cup sliced stuffed green olives
1 (4 ounce) can sliced black olives
½ cup sliced pepperoncini peppers
1 teaspoon Italian seasoning
¼ teaspoon garlic powder
or to taste
1 pinch seasoned salt
or to taste
ground black pepper to taste
⅓ cup Italian-style salad dressing (such as Newman's Own®)
¼ cup mayonnaise (such as Best Foods®)
½ cup shredded Parmesan cheese