Yes, these canned tomatoes will work, too. Unlike salsa which typically contains onions, there are no onions in Rotel and canned seasoned tomatoes. You may prefer no onions but if you want some onion flavor in your chili, just add some chopped onions into the mix. Sauté the onions first until they're almost tender in the pot you're using to cook the chili. Look out for pre-chopped onions at your local grocery store. Additionally, you can also add onion powder if you don't have any onions on hand.