Preheat the oven: Preheat your oven to 350°F and grease a 9x13 inch baking dish with butter or nonstick spray.
Sauté the aromatics: Melt butter in a large skillet over medium heat and cook the onion for 4-5 minutes until soft and translucent. Add the garlic and cook 30 seconds more, until fragrant.
Mix the sauce: Stir the chicken broth and cream of chicken soup into the skillet until smooth and well combined. Season with salt and pepper.
Combine rice and chicken: In a large bowl, mix the uncooked rice, shredded chicken and frozen vegetables. Pour the broth mixture over the top and stir until everything is coated.
Transfer to the dish: Pour the mixture into the prepared baking dish and spread it into an even layer so the rice cooks at the same rate.
Cover and bake: Cover the dish tightly with foil and bake for 45 minutes, until the rice is tender and most of the liquid is absorbed.
Add the cheese topping: Remove the foil, sprinkle 2 cups of cheddar cheese evenly over the top, and scatter the crumbled turkey bacon on top if using.
Finish baking uncovered: Return the dish to the oven uncovered and bake 10-15 minutes more, until the cheese is melted and golden in spots.
Rest before serving: Let the casserole rest for 10 minutes before scooping so the sauce thickens and holds its shape on the plate.