Preheat the oven to 375°F (190°C).
Carefully remove the stems from the mushrooms and set the caps aside.
In a skillet, cook the sausage over medium heat until browned, breaking it up as it cooks. Drain any excess fat.
Add the breadcrumbs, Parmesan cheese, parsley, garlic powder, salt, and pepper to the cooked sausage. Mix well.
Spoon the sausage mixture into each mushroom cap, packing it tightly.
Place the stuffed mushrooms on a baking sheet lined with parchment paper. Drizzle lightly with olive oil.
Bake for 20-25 minutes or until the mushrooms are tender and the filling is golden.
Serve warm and enjoy!