Preheat your oven to 400°F (200°C).
In a large pot, combine the milk, condensed bacon soup, cream cheese, garlic powder, and onion powder.
Bring the mixture to a gentle boil, stirring frequently.
Break the spaghetti in half and add it to the pot once the liquid starts bubbling.
Lower the heat to medium-low and cook for about 8 minutes, stirring occasionally until the pasta softens.
Mix in 2 cups of mozzarella cheese and half of the crumbled bacon. Add salt and pepper to taste.
Pour the pasta mixture into a greased 9×13-inch baking dish. Sprinkle the remaining mozzarella and bacon on top.
Bake for approximately 15 minutes, or until the cheese is melted and golden.
Let the casserole rest for about 5 minutes before serving. Garnish with fresh chives if desired. Enjoy!