Bake butternut squash in 350 oven until done – about 1 ½ hours. Cool. Peel, remove seeds, mash with potato masher and set aside. In large stock pot add about 5 tbsp. olive oil, add apples, carrots, leeks (if using) and onions and begin sautéing. Add cinnamon, ginger, nutmeg, and garlic. Stir to combine and continue sautéing. Add salt, cayenne pepper, thyme and sage. Sauté about 10 minutes. Add apple cider vinegar, vegetable broth, and bay leaves. Stir to combine. Add butternut squash and stir carefully so you don’t break up the bay leaves. Simmer for about 30 minutes until flavors are well blended. Remove from heat. Remove bay leaves. Blend in multiple batches in blender or use immersion blender (be careful not to burn yourself with hot soup mixture. Add yogurt and stir well to combine. Serve in bowls with dollops of yogurt and sprinkles of cinnamon and chives, green onions, and/or thyme for garnish.