Cook the quinoa according to the package instructions and let it cool slightly.
Grill the chicken breast until fully cooked, then slice into strips.
Wash and prepare all the vegetables.
Arrange the mixed greens as the base in a large serving bowl.
Add the cooked quinoa, grilled chicken, avocado slices, cherry tomatoes, and cucumber.
Drizzle with olive oil and fresh lemon juice.
Season with salt and black pepper to taste.
Garnish with fresh parsley or cilantro if desired.
Serve immediately and enjoy.