Carefully remove the stems from the mushrooms. Use a spoon to gently scrape out the insides, creating enough space for the filling.
Finely chop the onion and garlic. Heat the olive oil in a skillet over medium heat.
Sauté the onion for 2-3 minutes, then add the chopped walnuts and the scooped-out mushroom insides.
Stir in the BBQ sauce, smoked paprika, salt, and black pepper. Cook for another 3 minutes.
Remove from the heat and stir in the breadcrumbs and finely chopped parsley.
Fill the mushroom caps with the walnut mixture, pressing it in gently.
Preheat the grill to medium-high heat and place the stuffed mushrooms on the grill grates.
Grill for 8-10 minutes, or until the mushrooms are tender and the tops are slightly browned.
Remove from the grill, garnish with freshly chopped parsley, and serve immediately.
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