Set your oven to 375°F (190°C) so it’s ready when you need it.
Heat 2 tablespoons of vegetable oil or butter in a skillet over medium heat. Add the chopped shrimp and cook for 2–3 minutes until warmed through.
In a bowl, mix the cooked shrimp, crab meat, cream cheese, Parmesan, Cajun seasoning, garlic powder, black pepper, and salt. Stir until smooth and fully combined.
Spoon the mixture into each mushroom cap. Gently press it in, but don’t overfill.
Place the stuffed mushrooms on a greased or lined baking sheet. Bake for 15–20 minutes until soft and the tops are golden.
Take them out of the oven and sprinkle with chopped parsley. Serve warm and enjoy!