Make 4-6 aluminum foil bundles; spray with non stick cooking spray. Wash potatoes and cut into slices. In a mixing bowl, place the potato slices and toss with the ranch dressing. Mix well. Evenly distribute the potato slices on the aluminun foil "bundles". Sprinkle with salt and pepper, then the bacon crumbled and last, the cheddar cheese. Fold up the foil to make a bundle, making sure it is sealed well. Place on a baking sheet and place in a 400 degree oven for at least 45 minutes. Check after 45 minutes for doneness. These are GREAT with grilled steak, chicken or burgers. Quick and Easy!