In a medium pot, cook turnips, fennel, onion, and garlic in the olive oil until onion is tender and translucent.
Add dry white wine, if using, simmer 1 minute.
Add stock, simmer for 10 minutes.
Once the 10 minutes are up, add the heavy whipping cream, stir to combine. Continue cooking until it’s steaming but not boiling.
In a small bowl, combine reserved fennel fronds with xanthan gum, salt and pepper. Mix well - you want the xanthan gum evenly distributed, to prevent clumps.
Add xanthan gum mixture to the pot, along with the chicken.
Turn the burner down to low heat, gently simmer for 5 minutes, or until chicken is warmed through.
Season with additional salt and pepper, to taste.
Notes
Once cooled to almost room temperature, the soup can be stored in an airtight container in the fridge for up to 3 days.