Preheat your oven to 375 degrees Fahrenheit. Lightly grease a baking dish.
Cut the banana peppers lengthwise and carefully remove the seeds and membranes. You can wear gloves for this step if you prefer.
In a medium bowl, combine the softened cream cheese, mozzarella cheese, Parmesan cheese, garlic powder, onion powder, salt, and pepper. Mix until the filling is smooth and well combined.
Spoon the cream cheese mixture evenly into the hollowed-out banana peppers. Do not overfill.
Place the stuffed peppers open-side up in the prepared baking dish.
Bake for 20 to 25 minutes, or until the peppers are tender and the cheese filling is melted and lightly golden on top.
Remove from the oven, let cool slightly, and sprinkle with fresh parsley before serving.
Notes
For a low-carb option, this recipe fits well into a keto diet plan.
If you have a large garden harvest, this recipe is a great way to use many peppers quickly.
You can substitute the mozzarella with cheddar or Monterey Jack cheese for a different flavor profile.