In a medium saucepan, melt butter over medium heat. Add onion and celery, cooking until softened, approximately 7 minutes. Add squash, apple cider, broth, salt, curry powder, pepper, garlic powder, and smoked paprika, stirring to combine. Bring to a boil over medium-high heat. Reduce heat and simmer, uncovered, until squash is very tender, approximately 20 minutes. Remove from heat. Let cool slightly.
Transfer squash mixture to the container of a blender. Secure lid on blender, and remove center piece of lid to let steam escape. Place a clean towel over opening in lid to avoid splatters. Blend until smooth.
In a small bowl, stir together crème fraîche and milk until smooth. Drizzle over individual servings of soup.
Garnish with apple, if desired. Serve immediately.
Notes
Soup can be made up to 3 days ahead, cooled, placed in an airtight container, and refrigerated. Warm in a saucepan over low heat. Drizzle with crème fraîche mixture and garnish just before serving.
Recipe by TeaTime Magazine at https://teatimemagazine.com/curried-butternut-squash-apple-soup-recipe/