Drain and rinse chickpeas and add to skillet/pot with the BBQ sauce over low-medium heat. Cook until BBQ sauce reduces and sticks to chickpeas, 5-7 minutes. Set aside to cool.
Add all ingredients for dressing into blender and blend until smooth.
Place lettuce in bowls and top with chickpeas, sunflower seeds, green onion, shredded cheddar, and dressing.