Wash the mushrooms and carefully remove the stems. Set the caps aside and finely chop the stems.
Cook the quinoa according to package directions, then let it cool slightly. Meanwhile, dice the onion, garlic, and bell pepper.
Heat the olive oil in a skillet over medium heat. Sauté the onion and garlic until softened. Add the chopped mushroom stems and bell pepper, and cook until tender.
In a bowl, combine the sautéed vegetables with the cooked quinoa. Season with salt, pepper, and fresh parsley.
Spoon the quinoa mixture into the mushroom caps and place them on a baking sheet lined with parchment paper.
Bake the stuffed mushrooms in a preheated oven at 350°F (180°C) for 20-25 minutes, or until the mushrooms are tender and lightly browned.
Garnish the stuffed mushrooms with toasted sunflower seeds and fresh parsley before serving. Best enjoyed warm.
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