Bring a large pot of salted water to a boil over high heat. Add pasta and cook according to package directions until al dente. Drain and rinse briefly under cold water to cool; drain well.
Whisk together mayonnaise, sour cream, ranch dressing mix, and black pepper in a large bowl until smooth.
Add cooled pasta, bacon, chicken, tomatoes, red onion, green onions, almonds, and 1 cup of the cheese to the bowl. Toss gently until evenly coated in dressing.
Cover and refrigerate for at least 1 hour or up to 3 days.
Stir pasta salad before serving. If needed, stir in a small amount of mayonnaise or milk to loosen. Top with remaining cheddar cheese and garnish with additional green onions. Recipe developed by Nicole Irwin