Preheat your oven to 375°F (190°C).
Clean the mushrooms and remove the stems.
Chop the mushroom stems finely and set aside.
In a bowl, mix the crab meat, cream cheese, breadcrumbs, Parmesan cheese, parsley, lemon juice, and garlic powder.
Add the chopped mushroom stems to the mixture and season with salt and pepper.
Stuff each mushroom cap with the crab mixture generously.
Place the stuffed mushrooms on a baking tray lined with parchment paper.
Drizzle a little olive oil over the stuffed mushrooms.
Bake in the preheated oven for 20 minutes or until golden brown.
Remove from the oven and let cool for a few minutes before serving.