I planted oodles of potatoes and onions this year and I am in the same predicament. I dehydrated green peppers for the first time and was pleased with the results. I diced them up and placed them on tray till dried. I will dehydrate my onions the same way. I am going to try my hand at canning potatoes (this will be a first) and also plan to dehydrate some. I am thinking potato slices to make scalloped potatoes and with the potatoes I can, I will be able to heat and make mashed. I'm not sure I helped much as this is new territory for me. I'm still in the research stage.
I stored tators in my basement ( in an area there, that is like a root cellar) and after a couple of months I found I had bad potatoes that spread to the rest and invited unwelcomed visitors. My appetite for potatoes were gone for awhile. lol So I will be storing potatoes differently from now on, leaving only enough to make french fries, etc... on occasions.