Preheat the oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
In a mixing bowl, combine the sliced beef, broccoli florets, and bell peppers with the soy sauce, olive oil, minced garlic, grated ginger, salt, and pepper.
Toss everything until the meat and vegetables are evenly coated.
Spread the mixture in a single layer on the prepared sheet pan.
Bake for 15 to 18 minutes until the beef is cooked through and the vegetables are tender but still bright.
Remove from the oven and serve over cooked rice, then sprinkle with sesame seeds.