Roasted Sweet Potato and Apple Soup

2 medium sweet potatoes, peeled and cubed
1 apple, peeled, cored and quartered
1 medium onion, peeled and quartered
1 cloves garlic, peeled
2 tbs vegetable oil
salt and pepper to taste
3-5 cups chicken or vegetable broth
yogurt, sour cream or goat cheese to taste (optional)

Preheat oven to 450 degrees.

Place sweet potatoes, apple, onion and garlic in a roasting pan, toss with oil and salt and pepper. Roast, stirring every 10 minutes, until potatoes are soft 20-30 minutes.

Puree vegetables in blender or food processor, adding just enough broth to cover. Will probably take 2 batches. Add more broth until soup is smooth but not too thick.

Heat over low heat. Can serve with yogurt, sour cream or goat cheese.