Preheat the oven to 400°F and line a baking sheet with parchment paper.
Place the 12 ounces broccoli florets on the baking sheet. Toss with 1 tablespoon olive oil, salt and pepper, and spread evenly on the baking sheet.
Place in the oven and roast for 20 to 25 minutes until fork tender. Remove from the oven and toss with the zest of 1 lemon and ¼ parmesan cheese.
Notes
Dry broccoli after washing. The key with roasted veg is to eliminate any water so that it doesn't steam and turn out too soft (we want firm-ish, caramelized veggies, not limp). After washing the broccoli, pat it dry to remove excess water.
Cut the florets into a similar size. This will also help with even baking! Try to break or cut up the broccoli into similar-sized florets.
Spread the broccoli out. Use a large enough baking sheet so that you can evenly spread out the broccoli florets. This will help them to bake evenly.
Can I use frozen broccoli? While there are methods for roasting frozen broccoli out there, I vastly prefer to use fresh broccoli and recommend it for this recipe.
Try with cauliflower. Use this method to make parmesan roasted cauliflower! Note that cauliflower will take a bit longer to cook, and it's just as delicious when tossed with lemon and cheese.