Step 1

Preheat oven to 400 degrees F. Line a baking sheet with parchment paper or a silicone mat.

Step 2

Remove leaves from cauliflower. Slice the bottom of the core off so that it will sit evenly on the baking sheet. Drizzle 1 tablespoon oil all over the cauliflower. Sprinkle with salt and pepper. Roast, core-side up, for 45 minutes.

Step 3

Stir the remaining 1 tablespoon oil and balsamic glaze together in a small bowl. Remove the cauliflower from the oven. Using a fork, gently separate the florets and drizzle the oil-and-vinegar mixture over and into the cauliflower. Roast, core-side down, for 15 more minutes.

Step 4

Remove the cauliflower from the oven. Combine Parmesan and thyme; pat all over the surface and into the crevices of the cauliflower. Return to the oven and roast, core-side down, until tender and browned, about 15 minutes more. Before serving, drizzle the cauliflower with any excess vinaigrette that has accumulated on the baking sheet.