1 medium onion, finely chopped (1 cup)
2 Tbs. olive oil
2 ribs celery, finely chopped (½ cup)
1 Tbs. ground cumin
2 cloves garlic, minced (2 tsp.)
1 10-oz. pkg. frozen chopped spinach, thawed and squeezed dry
2 15-oz. cans diced tomatoes, drained, liquid reserved
1 15-oz. can black beans, rinsed and drained
¾ cup quinoa
3 large carrots, grated (1½ cups)
1½ cups grated reduced-fat pepper Jack cheese, divided
4 large red bell peppers, halved lengthwise, ribs removed