Add chickpeas, lemon juice, lemon zest, garlic cloves, salt and onion powder to a food processor. Blitz on medium until mostly smooth (about 3 minutes). NOTE: Save a spoonful of chickpeas out for presentation.
Drizzle oil into the mixture while blitzing on low. Continue to blitz until it is at your desired consistency.
Transfer to a serving bowl and drizzle with extra oil and top with the chickpeas you saved out.