2 tablespoons olive oil
4 skinless, boneless chicken breast halves - cut into strips
1 large sweet onion, diced
2 Granny Smith apples - peeled, cored and sliced
1 red bell pepper, seeded and sliced into strips
1 tablespoon red curry paste
1 teaspoon ground cinnamon
1/2 cup chicken broth
1 cup plain yogurt
salt and pepper to taste