Pre-heat oven to 350°C/180°F degrees.
Line a baking sheet with parchment paper. Lay out bacon about 1/2-inch apart.
Cut sweet potatoes in quarters (or cut loosely in large pieces), and place on a separate baking sheet.
Bake both sweet potatoes and bacon for 40 minutes. Remove sweet potatoes from oven and continue to cook bacon until done – about 5-10 minutes.
In a large stock pot, cook celery, carrot, onion and garlic with butter for 1-2 minutes over medium heat.
Add bone broth or stock and sweet potatoes. Simmer for 5-7 minutes.
Use an immersion hand blender to puree sweet potatoes in stock pot. Once fully pureed, turn off heat and set aside.
In a small bowl mix yogurt and maple syrup. Set aside.
Serve soup with a dollop or two of the maple cream. Top with crumbled bacon and sprinkle with parsley.