Make the dressing: In a small bowl, whisk together olive oil, lemon juice, Dijon, garlic, honey, oregano, a pinch of salt, and pepper until emulsified. Set aside.
Prep the veggies: Dice the cucumber, bell pepper, and avocado. Halve the tomatoes and thinly slice the red onion.
Chop the herbs.
Rinse and drain: Rinse chickpeas well and drain. If using frozen shelled edamame, thaw under warm water and pat dry.
Assemble the base: Add mixed greens to a large bowl. Top with cucumber, bell pepper, tomatoes, red onion, chickpeas, and edamame.
Add the creamy and crunchy: Gently fold in avocado and sprinkle sunflower or pumpkin seeds over the top.
Add feta or cottage cheese if using.
Dress and toss: Pour the dressing over the salad. Toss gently to coat without mashing the avocado. Taste and adjust salt and pepper.
Serve: Plate immediately for the best texture, or portion into meal-prep containers (see storage notes).