Prepare couscous mix according to package. If you're using your own couscous, be sure to season.
While the couscous is cooking, prep vegetables; chop cucumber, peppers, red onion, and cherry tomatoes. Finely chop parsley and soak the red onion in cold water for 10 minutes.
Drain and rinse chickpeas, roast in the oven if preferred.
Prepare the dressing by adding all to a mason jar. Seal the jar and shake until combined.
TO SERVE: Add couscous to a large bowl and allow to cool, add in vegetables and chickpeas. Add in feta cheese, freshly squeezed lemon, salt and pepper to taste, and dressing.
TO MEAL PREP: Divide the dressing evenly into 6 small containers. Divide the rest of the ingredients into 6 equal parts in small containers and refrigerate.