Preheat oven to 425°F (220°C). Line a large baking sheet with parchment paper or foil.

In a large bowl, toss cauliflower florets with olive oil, Old Bay seasoning, chili pepper, and black pepper until well coated.

Spread the cauliflower evenly on the baking sheet, leaving space between pieces.

Roast for 25–30 minutes, flipping halfway through, until golden brown and crispy on the edges.

Sprinkle cheddar and parmesan over the roasted cauliflower. Return to oven for 5 more minutes, or until cheese is melted and bubbly.

Serve immediately while hot and crispy.