Preheat oven to 400°F (200°C). Line a large baking sheet with parchment paper.
In a large bowl, toss the cubed steak, potatoes, olive oil, salt, pepper, and garlic powder until well combined.
Spread the steak and potato mixture in a single layer on the prepared baking sheet.
Roast for 20 minutes.
Add the broccoli florets to the baking sheet and toss gently with the steak and potatoes. Continue roasting for another 10-15 minutes, or until the potatoes are tender and the broccoli is crisp-tender.
Serve hot.
Notes
For extra flavor, you can add a squeeze of lemon juice or a sprinkle of fresh herbs before serving.