Mediterranean Chickpea Salad

Make salad: In a large bowl, toss together chickpeas, cucumber, bell pepper, red onion, olives, and feta. Season with salt and pepper.  Make vinaigrette: In a jar fitted with a lid, combine olive oil, vinegar, lemon juice, parsley, and red pepper flakes. Close the jar and shake until emulsified, then season with salt and pepper.