Preheat the oven to 400°F. Lightly coat a 2-quart baking dish with nonstick cooking spray.
In a large mixing bowl, stir together the softened cream cheese, sour cream, ranch seasoning, 9 slices of the crumbled bacon, 1½ cups of the shredded Colby Jack cheese, and 2 of the chopped green onions until well combined.
Fold in the shredded cooked chicken until evenly coated.
Spread the mixture evenly into the prepared baking dish.
Sprinkle the remaining ½ cup shredded Colby Jack cheese over the top.
Bake uncovered for 25-30 minutes, or until the dip is hot, bubbly, and the cheese is melted.
Top with the remaining crumbled bacon and chopped green onions. Serve warm with crackers, tortilla chips, celery sticks, or sliced bread.