Cooking
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The second one seems the most similar.
This sounds delicious. Have you not tried exactly what you described? Was the dough pie crust-ish? Because then you have a mashed potato pot pie. Or was the crust biscuit-y? I think you should try to recreate the dough first, then add the potatoes and cheese. I feel the potatoes will need some seasoning, that's all. Maybe some milk to make them lighter?
"might have been just flour and water", meaning prolly not going to rise from yeast or baking powder? The form is slightly off, but you can make a pretty awesome potato cheese welsh pasty / scottish bridie / english butter pie. That's gonna be a more crust-like than bready, obviously.