Immediately after removing the potatoes from the oven, fully cut the cooked potatoes, length-wise, along the slit you've created before they baked.Using a hot pad in one hand to hold the hot potato, using a spoon, scoop out the inside of the potato into a medium-sized bowl.Add all the other ingredients (except the reserved cheddar cheese) and stir to combine and break up the potato bits. You don't want it completely smooth, chunks of potatoes are fine.Place the potato skins into an oven-proof casserole and pile the potato filling back into each skin, evenly distributing the potato mixture among the skins.Sprinkle the reserved cheddar cheese over the tops of each of the potatoes.At this point, they can be covered and refrigerated until ready to bake.When ready to eat, preheat the oven to 350°F and place the potatoes into the oven, uncovered, for about 20 minutes or until the potatoes are heated through and the cheese is melted.