Soup: Apple-Potato Soup

Ingredients:
2 tsp olive or canola oil
1 Granny Smith apple, peeled and diced
3/4 c Yukon Gold potatoes, peeled and diced
1/3 c yellow onion, finely chopped
1/4 c celery, thinly sliced
1/4 tsp salt
1/4 tsp dried Sage
pinch Paprika
1/4 tsp white pepper
1 and 3/4 c vegetable broth
3 Tbs nonfat plain Greek yogurt

Directions:
Heat oil in large saucepan over medium heat. Add apple, potato, onion, and celery. Cook, stirring frequently, until onion is translucent. Stir in spices and cook about a minute more. Stir in broth and bring to a simmer. Reduce heat, cover, and simmer gently until potatoes are fork-tender, about 15 minutes. Transfer soup, in batches, to blender or food processor and puree until smooth. Return to saucepan, stir in yogurt, and heat on low until warmed through. Yum.