Gather all ingredients.
Preheat the oven to 400 degrees F (200 degrees C).
Scoop out some flesh in the center of each avocado and place into a large bowl.
Add shredded chicken, cream cheese, tomatoes, salt, black pepper, and cayenne pepper; mix well to combine.
Spoon chicken mixture into each avocado; top generously with Parmesan cheese. Place filled avocados, face-up, in muffin cups to stabilize.
Bake in the preheated oven until cheese is melted, 8 to 10 minutes.
