Chicken Hash Brown Casserole

Name: Chicken Hash Brown Casserole
Ingredients: 8 ounce block cream cheese, softened to room temperature; 1 cup mayonnaise ((or sour cream)); 1 cup milk; 32 ounce bag frozen diced hash brown potatoes; 1/4 cup (1/2 stick) salted butter, melted and cooled slightly; 2 cups shredded triple cheddar cheese mix ((divided use)); 1 ounce packet ranch seasoning mix; 1 teaspoon onion powder; 1 teaspoon garlic powder; 2 cups diced cooked chicken ((I used a rotisserie chicken)); 1/2 pound bacon, cooked and crumbled ((divided use)); sliced green onion ((for serving))