Boil the pasta according to package instructions, drain, rinse with cold water, and set aside.
Cut chicken breasts into bite-sized pieces, then toss with olive oil, garlic salt, and black pepper.
Melt butter in a skillet, add drained corn, season with cayenne and black pepper, sauté for 5 minutes, then remove to a bowl.
In the same skillet, cook chicken on low heat until fully cooked.
Dice cucumber, red bell pepper, red onion, and green onions; place in a large mixing bowl.
Dice the cheddar cheese into small pieces.
Prepare ranch dressing by mixing the packet with buttermilk and mayonnaise according to package directions; refrigerate.
Combine barbecue sauce, soy sauce, dried oregano, garlic powder, and onion powder in a separate bowl.
Add a few tablespoons of the barbecue sauce mixture to the chicken while cooking, then remove chicken from heat and let cool.
Mix several tablespoons of barbecue sauce into the ranch dressing to create the barbecue ranch dressing.
Combine diced vegetables, cooked pasta, cooled chicken, sautéed corn, and cheddar cheese in the large bowl and toss thoroughly.
Drizzle barbecue ranch dressing over the salad and toss again to coat.
Serve the salad topped with dried parsley and extra barbecue sauce and ranch dressing on the side.