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Adjust rack to middle position and preheat oven to 425 degrees. Wash and dry broccoli; cut into bite-size pieces. Toss on a baking sheet with a drizzle of olive oil, salt, and pepper. Roast on middle rack, tossing halfway through, until lightly browned and crisp, 15-20 minutes. In the last 1-2 minutes of cooking, carefully sprinkle broccoli with Mexican cheese. Return to oven until cheese has melted.