In a saucepan brown the hamburger meat and the onion. Drain set aside.
In a Pam sprayed casserole dish add the beans, ketchup, mustard, and brown sugar mixing well.
Add the browned meat mixture to the bean mixture and stir mixing well.
Cook beans until throughly hot maybe 15 minutes then add the velveeta cheese on top put back into stove until cheese is melted.
Take out and stir.
I had to really guess on measurements and cooking times because with this recipe I never measure exact amount. I know that I use way more Velveeta Cheese. I guess you can play with the recipe until you find your personal likings.