Preheat oven to 450 degrees F.

Heat 2 tablespoons oil in a large ovenproof skillet over medium heat. Add onion and cook, stirring occasionally, until tender and browned, 9 to 11 minutes. Add garlic, paprika, 2 teaspoons cumin, coriander, cayenne and allspice and cook for 30 seconds. Stir in chickpeas, tomatoes, spinach, quinoa (or couscous), raisins, water and 1/4 teaspoon salt. Cook, stirring, for 5 minutes. Remove from heat.

If thawed squash is watery, place in a fine-mesh sieve and gently press to extract excess liquid. Transfer to a medium bowl and stir in the remaining 1 tablespoon oil, 1/2 teaspoon cumin and 1/4 teaspoon salt. Spread the squash evenly over the chickpea mixture.

Cover the pan and bake until steaming hot, about 45 minutes for quinoa (15 minutes for couscous). Let cool for 5 minutes. Serve sprinkled with cilantro.