Preheat your oven to 375 degrees F (190°C). Line a baking sheet with parchment paper.
In a mixing bowl, combine cream cheese, green onions, garlic powder, dried herbs, sea salt, and black pepper. Mix until smooth. Stir in cheddar cheese if using.
For the meaty versions, fold in cooked ground turkey into the cream cheese mixture. If you are adding turkey then, you will need to use less cream cheese, otherwise it won't fit. Or simply use larger bell peppers.
Fill each pepper half with the cream cheese mixture using a small spoon or piping bag.
Arrange the peppers in a single layer on the baking sheet. Top with extra cheese if desired.
Bake for 15-20 minutes or less if using your air fryer (the time will depend on which air fryer you use), until the cheese is melted and golden.
Let cool slightly, garnish with fresh herbs or bagel seasoning, and serve.