If you like more creaminess and more Ranch flavor, double the sour cream, Ranch and milk portions.
These make terrific leftovers, so depending on how many you are cooking for, you could double the recipe to have leftovers.
Pre-heat oven to 350. Place bacon slices on a cookie sheet and bake for about 15 minutes in the oven. (Thinly sliced bacon works best for preparing in the oven.) While the bacon is in the oven, put on a pot of water to boil the potatoes in, adding a dash of salt to the water. Then slice the potatoes very thin, using a mandolin slicer if you have one. You want your potatoes no more than about 1/8 inch thick.
When the water has come to a boil, add the potatoes and boil for only 4-5 minutes. Drain the potatoes and place in a generously greased (buttered) baking dish, laying out as much as you can, although it is OK to have them overlapping. A 9X13 may be too big for this dish, but use whatever you want. (I used an oval dish that is about 8X10.) In a bowl, mix together the sour cream, Ranch, milk, cayenne & dill. Poor over the potatoes. It will not be enough to cover them all. Top with the cut green onions, crumbled bacon and grated cheese.This is before the cheese was added.Bake at 350 for 20-25 minutes.