Crack Chicken Casserole

Name: Crack Chicken Casserole
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 1½ cups dry elbow macaroni; 3 tablespoons butter; 1 small yellow onion, (diced); 2 cups sour cream; 4 ounces cream cheese, (softened); 10.5 ounces cream of chicken soup, (undiluted); ¼ cup milk or half-and-half; 1 ounce ranch dressing seasoning packet; 1 teaspoon kosher salt; ½ teaspoon black pepper; 1 teaspoon onion powder; 3 cups shredded cheddar cheese, (divided in half); 3 cups skinless boneless chicken breast, (cooked and cubed); 16 slices bacon, (cooked and diced (this measures 1½ cups once cooked)); 1 green onion, (sliced thin)