Using a melon baller or a small, sharp knife, remove the middle of each cucumber piece, leaving the bottom intact.
In a medium bowl, mash the avocado with a fork. Stir in the lemon juice, tomato, feta cheese, olives, salt and cayenne pepper.
Fill each cucumber cup with 2 teaspoons of the avocado mixture. Garnish with parsley, if desired. Serve.
Notes
Please note that I am not a medical or nutritional professional. I provide nutritional information for my recipes as a courtesy to my readers. It is calculated using the built-in recipe card calculator. While I attempt to provide information that is as accurate as possible, you should calculate the nutritional information independently before relying on it.