Put butter and chopped onions in a pan and simmer till the onions are soft. Let stand.
Brown the hamburger meat, drain.
In a mixing bowl combine the browned meat, cooked onions drained, brown sugar, BBQ sause. Stir the brown sugar in real well.
In a muffin pan, form the bsk in the muffin hole and spoon in the mixture till its even with the top of the muffin pan. Place a slice of velveta cheese on top. Slice the cheese to ur desired thickness! Place in the oven at 350*. Bake till cheese is melted and bsk are golden brown. Cool, serve and enjoy!!