Preheat the oven to 425 degrees and line a baking sheet with parchment paper.
Add all of the chickpea ingredients to the baking sheet and toss to coat. Place in the oven on the middle rack for 30 minutes, tossing every 10 minutes - be sure to keep an eye on them the last 10 minutes, to make sure they don't burn. Remove from the oven and allow to cool slightly.
Meanwhile, add all of the vegan ranch ingredients to a bowl and mix to combine. Taste and adjust the seasonings as needed. Set aside.
Remove the stems from the lettuce and break off the leaves. Wash and dry the lettuce. Place the lettuce in a large mixing bowl and add as much of the dressing as you'd like. Toss until coated.
To serve, transfer the lettuce to a platter and finish it off with the harissa chickpeas, sunflower seeds and vegan parmesan.
