Preheat your oven to 400° Fahrenheit. Line a baking sheet with parchment paper and set aside.
Take the frozen broccoli, separate any clumps, and put them in a large bowl. Drizzle olive oil over the broccoli and sprinkle garlic powder and onion powder. Toss everything together until the broccoli is well-coated.
Spread out the seasoned broccoli evenly on the baking sheet.
Place the baking sheet in the oven and let the broccoli roast for about 20-25 minutes until it's golden brown and crispy. Turn the broccoli pieces halfway through the roasting process.
Once done, squeeze fresh lemon juice and sprinkle the grated Parmesan cheese. Roast for an additional 5 minutes. If desired, season to taste with salt and pepper. Serve it hot, and enjoy!