Preheat your air fryer to 400 degrees F (200 degrees C).
Slice the lemon and add the slices to the air fryer pan.
Place the salmon filet on top of the lemon slices.
In a small bowl, mix together the garlic, dijon mustard, and honey. Spread this mixture over the salmon.
Air fry the salmon for 10-12 minutes, or until it reaches an internal temperature of 135 degrees F (57 degrees C).
While the salmon is cooking, toast the gluten-free bread.
Once the salmon is cooked, remove it from the air fryer and let it cool slightly.
Spread the avocado on the toasted bread.
Top with the salmon and drizzle with olive oil.
Season with salt and pepper to taste.