Chili meets mac and cheese in this fix-it-and-forget-it slow-cooker dinner. Hot tomato sauce, a Mexican canned tomato sauce that also includes spices and chiles for heat, kicks up the flavor. If you can’t find hot tomato sauce, regular canned tomato sauce with a tablespoon of chili powder mixed in is a good substitute. You can cook the pasta separately and add it in at the end of cooking, or use our alternative method and cook the pasta in the slow cooker with a few adjustments listed below.