Start by draining and rinsing chickpeas under cold water, then pat them dry. Removing extra moisture helps them absorb dressing better. Transfer them to a large mixing bowl as the base of your salad.
Dice ripe avocados into bite-sized chunks and lightly coat them with a squeeze of lemon juice to prevent browning. Thinly slice red onions so their sharpness doesn’t overpower the salad while still adding crunch.
In a small bowl, whisk olive oil, lemon juice, minced garlic, oregano, salt, and pepper. Letting the dressing sit briefly helps flavors blend and mellows the garlic slightly.
Add avocado, onion, herbs, and crumbled feta to the chickpeas. Pour dressing over the salad and gently toss so everything is coated without breaking down the avocado pieces.
Taste and adjust seasoning with extra salt, pepper, or lemon juice as needed. Serve immediately for the freshest texture or chill briefly before serving.