Bring a large pot of salted water to a boil. Add the elbow macaroni and cook according to package instructions until just al dente, usually around 7-8 minutes. Drain and set aside.
If your chicken isn’t already cooked, poach or roast it until fully cooked, then shred into bite-sized pieces. Cook the turkey bacon in a skillet over medium heat until crispy. Drain on paper towels and crumble once cooled.
In a large mixing bowl, combine the milk, sour cream, garlic powder, onion powder, salt, and pepper. Stir well until smooth. Add 1 1/2 cups of shredded cheddar cheese and mix until the cheese starts melting into the sauce.
Add the cooked macaroni, shredded chicken, and crumbled turkey bacon to the cheese sauce mixture. Stir gently to coat everything evenly.
Preheat your oven to 350°F (175°C). Pour the macaroni mixture into your baking dish. Sprinkle the remaining 1/2 cup of cheddar cheese over the top, followed by an even layer of breadcrumbs for that perfect crunchy topping.
Bake uncovered for 20-25 minutes, or until the top is golden brown and the cheese is bubbly. Remove from the oven and let it cool slightly before serving.