Preheat oven to 400°F.
In a big pot, stir collectively the milk, bacon soup, cream cheese, garlic powder and onion powder. Carry to a boil.
As soon as effervescent, break spaghetti in half and stir into pot. Scale back warmth to medium low and let spaghetti prepare dinner 8 minutes, stirring sometimes.
Stir in 2 cups of the mozzarella and 1/2 of the bacon. Season to style with salt and pepper and switch to a 9×13-inch baking dish.
High with remaining mozzarella and bacon and bake till cheese has melted and is beginning to flip golden brown, about quarter-hour.
Let sit 5 minutes earlier than serving. Garnish with recent chives, if utilizing. Get pleasure from!