Low Carb Chicken Cordon Bleu Casserole

INGREDIENTS

1 lb

boneless, skinless chicken breast, cubed

3 tbsp

salted butter

large head cauliflower, cleaned and trimmed of leaves (but left whole)

1/2 cup

chicken stock

12 oz

ham steak, diced

1/2 cup

chopped onion

1/2 cup

chopped mushrooms

1 1/4 cups

heavy cream

1 cup

grated Parmesan cheese, divided

1/2 cup

sour cream

slices Swiss cheese, divided

1 tsp

dried tarragon

sea salt and black pepper,