Cut the beef and vegetables into bite-sized pieces.
Stir-fry onions, bell peppers, and other vegetables in a pan.
Marinate the beef with bulgogi sauce.
Add the marinated beef to the pan and stir-fry. When cooked, mix with the vegetables.
Boil low-carb pasta noodles.
Mix the boiled noodles with the stir-fried bulgogi and stir-fry once more.
Serve on a plate.