Cook the onion, carrot, and celery in an oiled skillet over medium heat until tender.
Add the meat, bacon, and garlic, and cook until browned. Stir in the milk and no-tomato sauce, then simmer until the meat is cooked through, about 15 minutes.
Scrape the squash into spaghetti strings with a fork and re-heat if needed. Serve the meat sauce on top.