01 - Place eggs in a saucepan, cover with cold water by 1 inch, and bring to a rolling boil over high heat. Immediately remove from heat, cover tightly, and let stand for 10 minutes.
02 - Drain eggs and transfer to an ice bath or run under cold water for 3 minutes. Peel carefully and chop into 1/2-inch pieces.
03 - In a large mixing bowl, combine diced avocados, cherry tomatoes, cucumber, red onion, olives, and parsley.
04 - In a small bowl, whisk together olive oil, lemon juice, Dijon mustard, garlic, oregano, salt, and pepper until fully emulsified.
05 - Add chopped eggs to the vegetable mixture. Pour dressing over and gently fold with a spatula until evenly coated, taking care not to mash the avocados.
06 - Serve immediately at room temperature, or refrigerate for up to 2 hours to allow flavors to meld. Avoid longer storage as avocados may brown.