Preheat oven to 350°F. Toss chickpeas with 1 tablespoon of the oil. Spread in single layer on large shallow baking pan. Roast 15 minutes or until golden brown.
Meanwhile, heat small skillet on medium heat. Add coriander and cumin seeds; cook and stir about 2 minutes or until fragrant. Immediately pour out of hot skillet to avoid over-toasting. Finely crush using a mortar and pestle, small food processor, clean coffee grinder or a rolling pin.
Heat remaining 1 tablespoon oil in medium saucepan on medium heat. Add onion; cook and stir 3 minutes or until softened. Add garlic; cook and stir 1 minute. Add mustard seed, curry powder, salt and crushed seed mixture; cook and stir 1 minute.
Stir in tomatoes. Simmer 3 minutes or until liquid is almost completely absorbed. Add spinach; cook and stir 30 seconds or just until wilted. Stir in chickpeas until heated through.