Cut the avocado in half and remove the pit.
Scoop out a small amount of avocado flesh to create a bowl.
In a mixing bowl, combine the chopped spinach, feta cheese, and orange segments.
Drizzle olive oil over the mixture and season with salt and pepper.
Gently toss the ingredients until evenly coated.
Fill the avocado halves with the spinach mixture.
Sprinkle additional feta cheese and herbs on top if desired.
Serve immediately for the best flavor and texture.