Place the chickpeas and baking soda in a large saucepan and add enough water to cover the chickpeas by at least two inches. Stir and bring it to a boil, then cover, reduce the heat, and let the chickpeas simmer for about 20 minutes or until some of them and the skins are floating at the top.
Drain the chickpeas and rinse well with cold water. Put them back in the saucepan, fill it with water, and using your hand or a slotted spoon (hand is easiest) scoop out as many of the chickpea skins as you can.Repeat the straining and scooping about four times or until you've removed most of the skins.
Add the skinned chickpeas, 1/4 cup of water, tahini, lemon juice, olive oil, garlic powder, za'atar, and salt to a food processor bowl. Cover and process for about 45 seconds, scraping down the sides once or twice.
Taste the hummus, and add salt or other seasonings as needed. If the hummus is too thick, add more water, one tablespoon at a time. When the hummus is smooth and the consistency is right, add the parsley and pulse about 10 times.
Notes
Nutrition information is for a 3-tablespoon serving.This recipe makes about two cups. Refrigerate leftovers in a covered container for up to four days. It will thicken up when cooled. Add one to tablespoons of water and mix well to restore creaminess. Warm the hummus in the microwave for 20 seconds and stir well before serving.If desired, portion the hummus into small containers and freeze it for up to three months. Thaw it in the refrigerator. Add one to two tablespoons of water and mix well to restore creaminess.