Preheat the oven to 425°F with your baking sheet inside of the oven. Do not use parchment paper. This is a pro tip to get the cauliflower extra crispy.
Cut your whole cauliflower head into evenly sized cauliflower florets
1 large head of cauliflower
Place the florets in a large mixing bowl. Drizzle with extra virgin olive oil and toss well so the florets are evenly coated.
2 tbsp extra virgin olive oil
Add the garlic powder, paprika, salt, and black pepper. Toss again until the cauliflower pieces are well coated in the seasoning mixture.
1 tsp garlic powder, 1 tsp paprika, 3/4 tsp sea salt, 1/2 tsp ground black pepper
Sprinkle 1 tbsp arrowroot powder over the cauliflower. Toss again until the florets are lightly coated. The arrowroot powder is optional but it will help create a light, crispy coating on the cauliflower as they roast. You can alternatively use corn starch.
1 tbsp arrowroot powder
Spread the florets onto the preheated baking sheet in a single layer. This step is essential for making crispy oven roasted cauliflower. For the crispiest cauliflower, roast the florets directly on a baking sheet instead of lining it with parchment paper. The direct heat helps the cauliflower develop golden, crispy edges.
Roast for about 25 to 30 minutes, flipping halfway through so the florets cook evenly. The cauliflower should become golden and lightly caramelized on the edges.
When finished, you will have perfectly crispy roasted cauliflower with tender centers and delicious crisp edges.