Chop the potatoes and apples.
If using russets I peel them, if I am using Yukon Gold or other waxy style potatoes
I often just leave the skin on

Also slice the onions and chop the bacon.

Cook the potatoes and apples together,
another method is to fry the apples separate.
I actually prefer this method as the apples keep their shape and you either fold them in
or top the mashed potatoes with them.

While the potatoes and apples are cooking, fry the onion rings with the bacon.
You can add a touch of sugar to help caramelize the onions.

When the potatoes and apples are soft mash them,
together with a little butter and cream if you want.
Even apple juice works well.

The caramelized onions and bacon goes on top of the mashed potatoes and apples.
This goes well with ham, or pork chop. This is a Kassler Ripchen which is a smoked pork chop done
German style, simmered with saurkraut.

Here is the recipe for the Kassler Ripchen

Here I sauted the apples with the onions and finished it with apple slices
that were cooked for only a few minutes to heat and soften.

Another lower carb option is to cook half cauliflower and half potatoes.
Here I cut the potatoes very thin so they will soften together.

Another option is to add some cooked cabbage in the mash.

You can also add spinach or other greens to the mashed.