Preheat oven to 400ºF. Drain and rinse chickpeas and pat them try with a paper towel. Spread on a rimmed baking sheet and toss with 2 Tbsp. olive oil, 1/2 tsp. paprika, 1/2 tsp. ground cumin, and 1/4 tsp. each salt and black pepper. Bake for 30 minutes, shaking the pan halfway through. Let cool for 10 minutes.
While chickpeas roast, prepare Harissa Ranch Dressing. In a medium bowl, combine Greek yogurt, mayonnaise, lemon juice, harissa, dill, chives, garlic powder, paprika, salt and pepper; whisk to combine.
Carefully cut the grilled kernels from the corn cobs and transfer them to a large mixing bowl. Add chopped romaine, avocado, red onion, and cheese, season salad with a pinch of salt. Add half of chickpeas and about two-thirds of dressing; toss to combine. Scatter remaining chickpeas overtop (crouton style) and drizzle with remaining dressing.
Options for grilling corn:In a Pan: Add 1 Tbsp. of the oil to a large cast-iron skillet (or grill pan) over medium-high heat. Once hot, add corn and roll in oil; let cook, undisturbed for 4 minutes, until bottoms are lightly charred. Toss, and continue cooking in 2-minute intervals, until the corn is charred to your liking.On the Grill: Preheat grill to medium-high heat. Brush corn cobs with oil, and grill for 10 to 12 minutes, turning occasionally, until kernels are lightly charred.Over a Gas Range: Heat burner to medium-high heat. Lightly spray corn cobs with cooking spray, and place directly over flame for 6 to 8 minutes, turning to char all sides.