Heat oil in skillet and cube beef tips into small cubes. Toss beef tips in flour to coat and quickly sear them.
Dice onions and mince garlic.
Add all ingredients (except for cornstarch) in a 5 quart pot, bring the heat up to almost a boil, drop heat down to low, cover and simmer for at least 90 minutes. You can also use the crockpot and set it on low for the day.
1 hour before serving, mix the cornstarch with warm water to create a thick liquid and add to chili. If you’re adding chili beans, add them after you’ve added the cornstarch mix.
For added kick, you can add 1 jar of cut jalapeños and more cayenne pepper.