Add quinoa, garlic powder, half of lemon juice and vegetable broth to a sauce pan over medium heat, Cover with lid and cook for 20 minutes. Remove from heat, but do not remove lid and let sit for 10 minutes more. Remove lid and fluff with fork. Let cool another 10 minutes.
Combine remaining ingredients in a bowl and add cooled quinoa. Cover and place in refrigerator to cool for at least 1 hour. Serve or transfer to airtight container and store in refrigerator for up to 4 days.
Keyword bell peppers, carrots, cucumber, green onion, lemon, lemon juice, parsley, quinoa, summer salad