Marigold Tamales

Name: Marigold Tamales
Ingredients: 3 to 4 boneless skinless chicken breast halves (about 3 pounds); 1/2 onion, sliced; 3 garlic cloves, peeled and minced; 2 carrots, washed and halved lengthwise; 1 celery stalk; 1 bay leaf; 1 teaspoon dried oregano; 1 teaspoon dried organic marigold leaves; 1 teaspoon kosher salt; 4 cups masa harina (see Cook's Note); 1 1/2 cups lard; 2 1/2 cups reserved chicken broth, warmed; 1 teaspoon baking powder; 16 large dried corn husks, soaked (see Cook's Note); Serving suggestion: diced onions, dried organic marigolds, optional