Bring water and quinoa to a boil then reduce heat to low and simmer until all water is absorbed, about 16 to 20 minutes.
Meanwhile, whisk lime juice, garlic and cumin together in a bowl and set aside.
Add cooked quinoa to the bowl of lime dressing and stir.
If taking the salad on the go, allow quinoa to cool completely (or refrigerate overnight), then layer in a jar: greens, quinoa, avocado, mango, beans and red onions.
If preparing the meal at home, allow the quinoa to cool for 10 minutes, then toss all ingredients together in a large bowl.