Set the oven to 375°F (190°C) and line a baking sheet with parchment paper.
Slice the mini bell peppers in half lengthwise and remove the seeds.
Arrange them on the prepared baking sheet.
In a mixing bowl, combine cream cheese, cheddar cheese, Parmesan cheese, bacon bits (if using), garlic powder, onion powder, smoked paprika, and black pepper.
Stir until smooth and well mixed.
Spoon the filling into each bell pepper half, spreading evenly.
Mix panko breadcrumbs with melted butter and sprinkle on top of the stuffed peppers for a crispy texture.
Place the baking sheet in the oven and bake for 15-20 minutes, until the cheese is melted and bubbly.
Remove from the oven and sprinkle with fresh parsley or chives before serving.
Serve warm with ranch dressing, sour cream, or a spicy dipping sauce.