This Chicken Spaghetti Casserole is a comforting, cheesy dish that brings together tender chicken, creamy sauce, and perfectly cooked spaghetti. It’s an easy weeknight dinner that can be prepared ahead of time, making it a convenient go-to for busy families. The combination of cream of mushroom soup, chicken broth, and sour cream creates a rich and creamy base, while the bell peppers add a fresh pop of color and flavor. With a golden, cheesy topping, this casserole is a crowd-pleaser that’s sure to become a family favorite.