In a large mixing bowl, start by adding the diced ripe avocado, drained canned tuna, diced medium cucumber, finely chopped red onion, and halved cherry tomatoes. Gently mix the ingredients together until they are just combined.

Gently fold in the chopped fresh cilantro into the salad mixture, aiming for a harmonious blend without over-mashing the ingredients.

In a separate bowl, whisk together the olive oil, lemon juice, salt, pepper, and garlic powder if using. Whisk until fully emulsified.

Pour the prepared dressing over your salad mix and carefully toss everything together to coat each ingredient without mashing the avocado.

Taste your salad and adjust seasoning as needed by adding more salt, pepper, or lemon juice for a balanced flavor.

Serve immediately over a bed of mixed greens or refrigerate for about 30 minutes to enhance the flavors.