After searching on here I haven't found anything too similar. You could swap the sweet potatoes for regular ones but I find a mix of both works well. You can also swap the beef mince to any other, turkey or pork are good low fat options. Slow cooking really helps the flavours develop.
You can make the chilli a day in advance which will make for a tastier meal. Feel free to adjust the spices to your taste. Trust me on the chocolate!