1/2 onion, chopped
1 clove garlic, minced
1 tablespoon chili powder
1 1/2 cups chicken broth
1 (4 ounce) can canned green chile peppers, chopped
1 teaspoon ground cumin
1 1/2 cups canned peeled and diced tomatoes
1/2 cup chopped green bell pepper
1/2 cup shrimp
1/2 pound cod fillets
3/4 cup plain nonfat yogurt