Step 1: Preheat Your Oven - Start by preheating your oven to 425°F (220°C).
Step 2: Prepare the Baking Sheet - Line a baking sheet with parchment paper for easy cleanup.
Step 3: Toss the Broccoli - In a large mixing bowl, combine frozen broccoli, olive oil, kosher salt, and pepper. Toss to coat.
Step 4: Spread on the Baking Sheet - Transfer the broccoli to the baking sheet, spreading it out in a single layer.
Step 5: Roast in the Oven - Roast for about 20-25 minutes, tossing halfway through.
Step 6: Add Optional Ingredients - In the last 5 minutes, add lemon juice and Parmesan cheese if using.
Step 7: Serve and Enjoy - Remove from the oven and serve warm.