Preheat the oven to 400°F.
Cut about ½ inch off the tops off of the head of garlics and remove any loose papery outer layers.
Place garlic cut side up on enough foil to wrap the garlic. Drizzle oil on the exposed surface of the garlic. Wrap the sides up and place the foil wrapped garlic onto a baking tray.
Roast in the preheated oven until golden and soft, about 40-45 minutes. Roasting time will vary based on the garlic size.
Set aside to cool, then squeeze out the soft garlic from the paper cloves into the food processor.
Add drained chickpeas to the food processor along with lemon juice, tahini, salt, and the ice cubes. Blend for about 5 minutes until smooth. Taste and adjust as needed.
Spoon the hummus onto a plate or bowl, spread it to create swirls, and drizzle with olive oil, add whole chickpeas for garnish and fresh parsley. Serve with pita bread.