Baked Chicken with Apples and Barley

1 tablespoon olive oil

½ cup chopped onion

½ cup chopped red bell pepper

½ cup chopped green bell pepper

1 clove garlic, finely chopped

1 medium tart green apple, chopped

1-2 tablespoons curry powder

1 cup whole grain barley kernels

2-½ cups chicken broth

4 boneless, skinless chicken breasts

½ teaspoon garlic salt (or a little minced garlic)

3 tablespoons orange marmalade or apricot jam