Creamy Sweet Potato and Chipotle Soup

Name: Creamy Sweet Potato and Chipotle Soup
Ingredients: 1 tbsp olive oil; ½ onion, chopped; 2 cloves garlic, minced; 1 tsp freshly grated ginger; 2 gala apples, peeled and chopped; 1 celery rib, chopped; 2 large sweet potatoes, peeled and chopped; 4 cups vegetable or chicken stock (i used broth); 2 cups water (reduce or eliminate for a thicker soup); 1 chipotle pepper (from a can of chipotles in adobo), chopped; 1 cinnamon stick