Cut up onion, peppers, and jalapeño into bite size pieces and cook in oil. Then remove from pot.
Brown meat.
Add veggies back in and mix.
Add beans, diced tomatoes, tomato paste, tomato sauce, and chili powder and stir.
Then you can add different spices/sauces/whatever that you like to fuck with it and tweak it. (Cincinnati folks prefer a bit of cinnamon in their chili).
Cover and simmer on medium heat for about 20 minutes.
Season to taste and serve.