Homemade Cream of Mushroom Soup

Ingredients

• 1 lb fresh mushrooms ((chopped))
• 1 onion ((chopped))
• 2 cloves garlic ((minced))
• ¼ cup butter ((or coconut oil))
• 1 tsp salt
• ½ tsp black pepper
• 2 TBSP arrowroot powder
• 4 cups chicken broth
• ½ cup heavy cream ((optional, or coconut cream))
• ½ cup sour cream ((optional))