1. Cook the Pasta: In a large pot of salted water, cook the rotini pasta according to package instructions until al dente. Drain and rinse under cold water to stop the cooking process.
2. Prepare the Bacon: While the pasta cooks, cook the bacon in a skillet over medium heat until crispy. Remove and drain on paper towels, then crumble.
3. Combine Ingredients: In a large mixing bowl, add the cooked pasta, chicken, crumbled bacon, cherry tomatoes, cucumber, red bell pepper, and green onions.
4. Add Dressing: Pour the ranch dressing over the pasta and gently stir to combine all ingredients thoroughly.
5. Incorporate Cheese: Fold in the shredded cheddar cheese and season with salt and pepper to taste.
6. Chill Salad: Cover the salad and place it in the refrigerator for at least 30 minutes to allow the flavors to meld.
7. Serve: After chilling, give it a gentle stir, and taste for seasoning again before serving.