Gather all ingredients.

Heat vegetable oil in a large wok or skillet over medium-high heat; add beef and stir-fry until browned, 3 to 4 minutes.

Move beef to the side of the wok and add broccoli, bell pepper, carrots, green onion, and garlic to the center of the wok; stir-fry vegetables for 2 minutes.

Stir beef into vegetables and season with soy sauce and sesame seeds. Continue to cook and stir until vegetables are tender, about 2 more minutes.

Serve hot and enjoy!