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Preheat oven to 400F.
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Line a baking sheet with parchment paper.
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Cut cauliflower lengthwise through the core into 4 equally thick "steaks."
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Place cauliflower steaks onto the parchment lined baking sheet.
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Whisk oil, lemon juice, garlic, red pepper flakes, salt, and pepper together in a bowl.
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Brush 1/2 of the oil mixture on top of the cauliflower steaks.
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Roast cauliflower steaks for 15 minutes.
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Gently turn over each steak (gently!).
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Brush cauliflower steaks with remaining oil mixture.
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Roast until golden (about 15-20 minutes).