Broccoli and Leftover Mashed Potato Soup

Name: Broccoli and Leftover Mashed Potato Soup
Ingredients: 2 teaspoons bacon drippings; 1 onion, diced; 4 stalks celery, chopped; 1 pound bulk pork sausage; 1 teaspoon dried sage; 0.5 teaspoon paprika; salt and ground black pepper to taste; 4 cups finely chopped broccoli florets; 4 cups reduced-sodium vegetable broth; 4 cups leftover mashed potatoes; 1 (15 ounce) can whole kernel corn, drained; 1 (7 ounce) can diced green chilies; 2 cups sour cream