Preheat the oven: Set to 425Β°F (220Β°C). Line a baking sheet with parchment paper.
Mix the sauce: In a large bowl, whisk together olive oil, maple syrup, Sriracha, garlic powder, onion powder, salt, and pepper.
Coat the cauliflower: Add the cauliflower florets and toss until evenly coated with the sauce.
Roast the cauliflower: Spread florets in a single layer on the baking sheet. Roast for 25-30 minutes, stirring halfway through, until golden brown and tender.
Serve: Garnish with parsley if desired. Add a squeeze of lemon for a fresh zing and serve warm.