Loads of great things with mashed potato...
One of my family favorite is with leek and egg..
Mash tatties, but don't add too much milk..
Season well with salt and pepper
Add chopped and boiled leek.. (don't over boil the leek otherwise there wont be anything left after mixing)
Then chop (roughly) one egg per person and mix it in last

I would serve it with bacon bits... but i am sure a veggie sausage would work

I make a stock gravy with the leftover leek water.
Then another great one is get a big pan... Tatties on the bottom... fill with water so it nearly covers them.
Then add a layer carrot... and then a layer of onion.
Boil that that with lid on.. Make sure you don't run out of water.. When tatties are cooked... strain leftover liquid. And Mash it all well... Add butter and salt and pepper. And make gravy of the left over liquid
Reading previous messages... at least mine are healthier options.. LOL
Have fun