Mix water, oil, honey, mashed potatoes and yeast in a large bowl or stand mixer. Allow to rest for 10-15 minutes.
Add remaining ingredients, plus enough flour to make a firm dough. It's better to be too firm than too soft. Allow to rise until doubled.
Roll out to half the desired thickness of finished bun. Cut into rounds using a cookies cutter, biscuit cutter, measuring cup etc.. whatever size you want your buns
Place on greased cookie sheets and allow to rise 10-15 minutes.
Bake in 400 degree oven for 15 minutes. Cool, slice and enjoy a juice hamburger! Also makes great sandwich buns.