In large saute pan, over med/high heat, add ground beef & turkey. Cook until nicely browned. Drain excess fat.
Add stock to ground meat, along with potatoes, celery, onion, carrots, mushrooms & garlic, combine.
Stir in spices (salt, pepper, bay leaf, thyme & oregano).
Cover, reduce heat to med/low and simmer for at least 30 minutes or until veggies are tender.
If needed, at the end of cooking. increase heat and thicken with arrowroot powder mixed with one TBSP of water. Once it's thickened, turn off heat.
In the meantime, cook together cauliflower (cut into large florets) and peeled chopped potatoes. Cover with water and cook until tender.
Drain well.
Add 1 TBSP ghee and mash. Season with a little salt and pepper if desired.
Pour meat mixture into large ovenproof baking dish.
Top with cauliflower mash and bacon crumbles (if using).
Cover with foil and bake for 20 minutes at 375*. Remove foil, and continue baking for another 20 minutes or until hot a bubbly and cauliflower/potato mash is just starting to brown.