IN a large pot, cover potatoes with cold water and bring to a boil. Boil for 20-30 minutes, until fork tender. Strain potatoes and set aside to cool.
IN a medium bowl, whisk together mayo, sour cream, dressing mix and milk. Add cheese, bacon bits, green onions and stir.
PEEL the skin off the potatoes and cut into 1/2 inch cubes. Add potatoes to the dressing mix and gently stir until combined.