"This is a summer-favorite of my family. It has a great fresh flavor and is so easy for a weeknight meal. The avocado is a fun alternative to a mayo dressing. Serve alone, on top of lettuce, or in a whole wheat pita."
Bring water and quinoa to a boil in a saucepan. Reduce heat to medium-low, cover, and simmer until quinoa is tender and water has been absorbed, 15 to 20 minutes. Cool quinoa to room temperature, about 30 minutes.
Mix mashed avocado, cilantro, lime juice, salt, and pepper together in a bowl until dressing is smooth.
Combine quinoa, chicken, tomatoes, and scallions in a bowl; add avocado dressing and toss to coat.