In the bowl of a mixer, combine 2 cups of flour with the yeast.
In a small bow, mix together the water, potatoes, butter, sugar, and salt.
Add the wet mix to the flour mix. Beat with the whisk for 30 seconds on low, then for 3 minutes on high.
Switch to the dough hook and add the remaining flour, adding as needed until the dough pulls away from the sides of the bowl and forms a ball. The dough should be sticky still.
Let rise until doubled.
Preheat oven to 350 degrees F.
Sprinkle flour into a clean counter. Take a section of dough and set it on the counter right into the flour. Pressing down on the dough, rotate your hand in a circle and the dough will gather up into a ball. For a slider you want the bun quite small so these sections of dough are really small. About 3-4 tbsp of dough.
When the bun is formed place it on the cookie sheet.
Let them rise until doubled.
Bake in preheated oven for 10-12 minutes or until golden brown. Let cool slightly.