Step 1: Prepare the Quinoa. Rinse quinoa under cold water, combine with water, bring to a boil, reduce heat, cover and simmer for 15 minutes. Fluff with a fork.
Step 2: Chop Your Vegetables. Chop mixed greens, cherry tomatoes, cucumber, red onion, and avocado into bite-sized pieces.
Step 3: Assemble the Salad. In a bowl, combine mixed greens, vegetables, quinoa, and feta cheese. Toss gently.
Step 4: Whisk the Dressing. Combine olive oil, lemon juice, salt, and pepper in a bowl, then pour over salad and toss gently.
Step 5: Serve and Enjoy. Serve the salad and add toasted nuts or seeds for crunch.