In a pan on the stove over medium heat add a bit of olive oil. When hot add diced onions and ground beef. Break up and cook until almost all browned with a little bit of pink left. Drain any excess grease.
Turn heat to low and add brown sugar, mustard and ketchup. Stir together. Allow to bubble for about 3-5 minutes. Then dump into slow cooker.
Dump in can of rotel and can of undrained kidney beans. Stir together and close lid. Cook on low for 4-6 hours until beans are softened to your liking. Serve with cheese on top!!
Notes
Stovetop Directions
If you want to cook on your stove vs. a slow cooker use a larger pot when sautéing your meat and onions so everything will fit. Follow directions above but after sloppy joe sauce is combined and mixed add can of rotel and beans in the same pot. Keep on low, put a lid on and cook for 30 min - 1 hour stirring every 15 minutes until beans are as tender as you would like.