Line a baking sheet with parchment paper and preheat your oven to 350°F (180°C).
Shred the 250 grams maitake mushrooms with your hands into pieces that are about 3 ½ inches in size (9cm) and ¾ inch thick (2cm).
Add the maitakes to a bowl, drizzle them with 3 tablespoons olive oil, and then toss to coat evenly.
Sprinkle on the ⅛ teaspoon salt, ¼ teaspoon black pepper, and 30 grams pecorino romano, then toss to coat evenly.
Spread the mushrooms around the parchment-lined pan so they don’t overlap.
Roast the maitake mushrooms for 15 minutes.
Remove the pan from the oven and flip the mushrooms over. Continue roasting for another 10-15 minutes or until golden brown and crispy around the edges.