Curry Chicken

Ingredients:
1 pound boneless, skinless chicken breasts
2 tablespoons curry powder
1/4 teaspoon ground cinnamon
2 tablespoons olive oil
1 medium yellow onion, thinly sliced
2 medium zucchini, thinly sliced
1 1/2 cups low-sodium chicken broth
1 1/2 cups heavy cream
1 1/2 teaspoons kosher salt
1/4 teaspoon black pepper