Preheat the oven to 350°F (175°C).
Cook the macaroni according to package instructions until al dente, then drain.
In a large mixing bowl, combine the shredded chicken, crumbled bacon, and ranch seasoning mix.
In a saucepan over medium heat, combine cream cheese, milk, and garlic powder, stirring until smooth and creamy.
Stir in the shredded cheddar cheese and black pepper, continuing to stir until melted and combined.
Combine the cooked macaroni, chicken, bacon, and cheese sauce in a large baking dish, mixing well.
If using, sprinkle breadcrumbs on top of the mixture to add a crunchy texture.
Bake in the preheated oven for 20 to 25 minutes, until hot and bubbly.
Remove from the oven, let it cool for a few minutes, and serve warm.