Preheat the air fryer to 400°F.

In a small bowl, stir together the softened salted butter, garlic powder, salt and ground black pepper to taste, shredded Mozzarella, and shredded Parmesan until well combined and spreadable.

Cut the French baguette in half lengthwise to make two long halves.

Evenly spread the cheese-butter mixture over the cut side of each baguette half.

Place the baguette halves cut-side up in a single layer in the preheated air fryer basket (work in batches if they do not fit without overlapping).

Air fry for 5 minutes, or until the cheese is melted and the bread is lightly toasted to your liking.

Remove the bread from the air fryer, sprinkle evenly with the finely chopped fresh parsley, slice, and serve immediately.