01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - Clean the mushrooms and gently remove the stems. Set the caps aside and finely chop the stems.
03 - Heat olive oil in a skillet over medium heat. Sauté the chopped mushroom stems with a pinch of salt and pepper for 3–4 minutes until softened. Let cool slightly.
04 - In a bowl, combine cottage cheese, 1/4 cup Parmesan, basil pesto, parsley, minced garlic, and sautéed mushroom stems. Mix until well combined. Stir in red pepper flakes if using. Taste and adjust seasoning.
05 - Arrange the mushroom caps, cavity side up, on the prepared baking sheet. Fill each cap generously with the cottage cheese mixture.
06 - In a small bowl, mix panko breadcrumbs and 1 tablespoon Parmesan. Sprinkle evenly over the stuffed mushrooms. Lightly mist or drizzle the tops with olive oil.
07 - Bake for 18–20 minutes, until the mushrooms are tender and the tops are golden brown.
08 - Serve warm, garnished with extra parsley if desired.