1. Preheat oven to 350 degrees Fahrenheit and grease a 9″ x 13″ casserole dish.
2. Place bacon pieces in a cold frying pan and set over medium heat. Cook for about 8 minutes until bacon is crisp. Transfer to a plate lined with a paper towel.
3. Cook spaghetti according to the package directions. When done, drain and set aside.
4. Add the chicken, cream cheese, heavy cream, ranch dressing, and half of the mozzarella cheese to the pasta. Stir to melt the cheese and bring everything together. Pour mixture into the prepared casserole dish.
5. Top casserole with remaining mozzarella cheese and bacon bits.
6. Place in the oven and bake for 25 minutes, until casserole is bubbling and hot throughout.
