In a large bowl, whisk together olive oil, melted butter, lemon zest, and thyme.
Add broccoli florets to the bowl and toss to coat evenly.
Spread broccoli on a large baking sheet in a single layer.
Roast for 18-22 minutes, stirring halfway through, until broccoli is tender and edges are crispy.
Remove from the oven and immediately sprinkle with Parmesan cheese.
Season with salt and pepper; serve hot.
Notes
You can also use 1 teaspoon dried thyme instead of fresh thyme leaves.Cut the florets into similar-sized pieces for even cooking.The broccoli will shrink as it roasts, so don't cut the florets too small.You may need an additional 1/2 teaspoon of salt as the cheese contributes saltiness also. So just start with 1/2 teaspoon and then add more to taste.Refrigerate any leftovers in an airtight container for up to 5 days.