Dice potatoes, place in 4 quart pot, cover with water and bring to a boil. Cook until tender. Drain.

While potatoes are boiling cook bacon and crumble.

Also, while potatoes are boiling, cube Velveeta and dice onion.

In a large mixing bowl mix Miracle Whip, ground Mustard, and sugar.

Add potatoes, onion, and cheese. Stir gently until potatoes are well covered in dressing. Add bacon and stir.

Pour into 8x8 greased baking dish, cover with foil and bake at 350°F for 45 minutes or until hot and bubbley.