Chicken Florentine (Paleo, AIP, Whole30, Keto)

Name: Chicken Florentine (Paleo, AIP, Whole30, Keto)
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Italian
Ingredients: 4 boneless skinless chicken breasts; 1 tsp sea salt, divided; 3 tbsp coconut oil (or oil of choice), divided; 1/2 cup yellow onion, minced; 1 1/2 cup full fat coconut milk; 1 tbsp white wine vinegar or lemon juice; 1/2 cup chicken broth; 1 1/2 tsp garlic powder; 1/2 tsp ground thyme; 1/4 tsp dried parsley; 1 tbsp arrowroot starch or tapioca starch; 2 tbsp water; 3-4 cups fresh spinach