In a large bowl, combine breadcrumbs and milk; let soak for 2-3 minutes. Mix in onion, garlic, sage, parsley, Italian seasoning, parmesan, egg, salt, and pepper.
Gently add ground turkey until just combined; shape into meatballs and freeze for 20-25 minutes.
Sear meatballs in a heated skillet until browned and cooked through (165°F internal temperature).
In the same skillet, sauté onion in ghee and olive oil; add garlic and Italian seasoning before whisking in pumpkin puree and chicken stock. Simmer briefly.
Stir in cream, maple syrup, parmesan, and sage before adding back cooked meatballs to warm through.