Mushroom Chili Stew

Name: Mushroom Chili Stew
Ingredients: 2 tsp. chili powder; 1 tsp. ground cumin; 1/2 tsp. dried oregano; 14-oz. can diced tomatoes with green chiles; 1 Tbs. tomato paste; 15-oz. can navy beans, rinsed and drained; 15-oz. can pinto beans, rinsed and drained; 1 Tbs. balsamic vinegar; 1 scallion (white and light green part), cut into 1/2-inch pieces; 1/2 lb. cremini mushrooms; 1 Tbs. extra-virgin olive oil; 1 medium onion, chopped; 4 cloves garlic, minced; 1 medium portobello mushroom, stem removed; 1/2 lb. fresh shiitake mushrooms, stems removed