In a bowl, mix together hoisin sauce, Sriracha, and oil until well combined.

Add cauliflower florets to a large mixing bowl. Pour the sauce mixture over the cauliflower and toss well to coat evenly.

Spread cauliflower in a single layer on a baking sheet.

Roast for about 30 minutes, or until deep golden brown, flipping halfway through for even cooking.

Remove from oven and serve warm.