Divide the romaine lettuce between two bowls, using about 1 cup per bowl. Top each bowl with 1 cup cooked quinoa. Make sure the quinoa has cooled slightly before assembling so the greens don’t become soggy.
Divide the falafel evenly between the bowls, adding about 2–3 pieces to each.
Divide the cherry tomatoes, cucumber, thinly sliced red onion, and pickled onions or pickles between the two bowls. Divide the sliced avocado between the bowls as well.
Divide the Kalamata olives between the bowls, then sprinkle the crumbled feta over the top.
Add ¼ cup hummus to each bowl, either in one dollop or in smaller spoonfuls around the bowl.
Finish with the chopped fresh parsley.
If the falafel was prepared ahead, warm it in a 350°F (175°C) oven for 8–10 minutes for the best texture. It can also be served at room temperature.