It is best not to peel the potatoes when making this crispy smashed red potatoes recipe.  The skin is what helps hold the potato intact and if you peel it, the potatoes may not hold their shape.  Just be sure to clean the potatoes really well before preparing.  I generally like to soak them in a bowl of water to remove the dirt, then rinse with clean water.  They will also clean up more in the boiling water.