This is not "authentic" but I got the recipe from a tex-mex book and it works pretty well
1 kilo of minced beef
200 gr pancetta chopped
1 large spanish onion chopped
2 red peppers chopped
1 aubergine diced
5 large cloves garlic, smashed
1 dsp guajillo chili powder
1 dsp chopped dried chipotle chili
1 dsp smoked paprika
1 dsp toasted and ground black cumin
1 dsp dried Mexican oregano
1 tsp dried thyme
a few squares of bitter black chocolate or a TBSP mole paste
Brown the beef and pancetta, add the onions halfway through, near the end add the chili powders and herbs cook until they start to release their aromas. Add about 1/2 litre of beef stock, garlic, aubergine and peppers and cook in a slow cooker at least ten hours. Add the chocolate towards the end.
Serve topped with fresh coriander.
I don't usually put beans in the chili, but serve refried beans separately.