Swedish Meatballs

1 can cream of mushroom soup 2 cups beef broth 1 cup fresh, sliced mushrooms ½ cup diced onion 1 teaspoon garlic powder 2 tablespoons A1 Steak Sauce

½ teaspoon paprika ½ teaspoon salt ½ teaspoon pepper 1 (28 ounce) bag frozen homestyle meatballs 1 cup sour cream