Wash and chop all vegetables into bite-sized pieces. Slice bell peppers and carrots thinly, and separate broccoli into florets.

Set everything aside in individual bowls for easy access during cooking.

Heat 1 tablespoon of oil in a large skillet over medium-high heat for about 2 minutes.

Add ground beef, breaking it up with a spatula, and cook for 5 to 7 minutes until browned.

Drain excess fat to keep the dish lighter.

Add bell peppers, broccoli, and carrots to the skillet, stir-frying for 5 to 7 minutes until tender.

Introduce minced garlic, soy sauce, and sesame oil, sprinkling cornstarch over the mixture.

Cook for another 2-3 minutes while stirring to combine.

Fold in chopped green onions just before serving.

Plate the stir fry over rice or noodles.