Place the ground chuck in a large skillet over medium heat and brown with onions and garlic until onions are tender.
Drain well.
Place the tomatoes, tomato sauce, chili powder, cumin, salt and pepper into a large saucepan.
Place over high heat.
Bring to a rapid boil.
Add the meat and beans.
Reduce heat to low.
Cover and simmer for 1 hour.
Remove lid and continue cooking for 10 minutes.
Place saucepan in the refrigerator for a rapid cool.
Pour chili into freezer containers and freeze for up to 3 months.
To reheat, remove chili from the freezer.
Place 1/4 C of water in a saucepan.
Add the chili and cook over medium heat until heated through.
To thicken chili mix the cornstarch and 1/4 C water together.
Add to the chili and stir well.