My whole famliy loves this. I orginally made german potato salad but my family didn't like the vinegar in it so I altered the recipe and came up with this, I make it all the time, people are asking me to bring it for cookouts or on holidays.
1Cook the potatoes in water; DRAIN , set aside.
Cook the bacon, cool, crumble, save the drippings. Set aside
2Melt the butter or margarine, add the onion, let brown till butter is melted. Add the flour to make a thick paste. Add the half and half, stir until thickened , about gravy like texture, if needed add a little more flour to thicken. Turn off heat. Add the mayonnaise and mustard, salt and pepper. Stir well. Ad about half the bacon bits and the drippings, stir. put into casserole dish and add the rest of the bacon bits on top, bake for 45 min or until bubbly.