Adjust an oven rack to the middle position and preheat oven to 450 degrees. In a large bowl, add green beans, olive oil, garlic, and salt and pepper (I like at least ½ teaspoon salt and ¼ teaspoon pepper) and toss until evenly coated.
Transfer to rimmed baking sheet and spread in an even layer. Roast until lightly browned in some places but still crispy, about 20 to 25 minutes. Sprinkle with Parmesan cheese and serve with lemon if desired.
Video
Notes
Cauliflower: Look for one that is bright off-white, firm and heavy, without any brown discoloration or soft spots. Cut the cauliflower florets into pieces that are all about the same size so they cook evenly.
Parmesan: Any hard, aged cheese will work well instead. Think Parmesan, grated Asiago, pecorino, or Romano cheese.
Yield: This recipe makes 8 servings.
Storage: Store leftovers covered for up to 4 days.