Preheat the oven to 450°F. Cut the cauliflower florets into 1-inch pieces and combine with the garlic in a large bowl. Drizzle with the olive oil and toss to coat.
In a small bowl, combine the turmeric, cumin, pepper flakes, and salt. Sprinkle over the cauliflower and toss to coat. Spread the cauliflower out on a large rimmed baking sheet.
Bake, stirring occasionally, until browned on the edges and tender, 23-27 minutes. Remove the from oven, sprinkle with cilantro, and serve hot!