Cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to cool.
In a large mixing bowl, combine the cooked pasta, cherry tomatoes, black beans, corn, bell pepper, and shredded cheddar cheese.
In a small bowl, whisk together the ranch dressing and taco seasoning until well combined.
Pour the dressing mixture over the pasta salad and toss gently to coat all ingredients evenly.
Season with salt and pepper to taste.
Cover the salad and refrigerate for at least 30 minutes to allow the flavors to meld.
Before serving, give the salad a good stir and garnish with fresh cilantro if desired.