COOK THE POTATOES: While the bacon is cooking, peel and chop the potatoes. Transfer the bacon to a paper towel lined plate to drain. There should be 2-3 tablespoons of bacon grease left on the sheet pan
. (If there is more than that, drain off a bit.) Put the potatoes on the pan and toss with tongs to thoroughly coat them in the bacon grease. Sprinkle with salt and pepper. Spread the potatoes out in a single layer and bake for 20 minutes, stir well and bake an additional 20 minutes. Stir again, making sure that none of the potatoes are sticking to the tray. Bake another 15 minutes.