Can this be made in under 30 minutes?

Yes, the recipe is designed to be quick and efficient.

Does it work for meal prep?

Most versions store well for one to three days.

Yes, simple swaps can be made for convenience or dietary needs.

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Slice the beef, onion, and bell peppers.
In a bowl, mix soy sauce, sesame oil, optional garlic, and optional sugar. Marinate the beef for at least 15 minutes.
Heat vegetable oil in a skillet over medium-high heat. Sauté onions and bell peppers until tender, about 5 minutes.
Push veggies to one side; add marinated beef to the skillet. Cook until browned, about 5 minutes, stirring occasionally.
Mix in chopped kimchi; cook for an additional 2 minutes.
Assemble by placing the bulgogi mixture on toasted hoagie rolls and topping with cheese. Broil for about 2 minutes until cheese melts.

For best results, use a very sharp knife to slice the beef thinly. Drain excess liquid from kimchi to avoid a soggy sandwich.