Mix the flour, salt, baking powder and sugar thoroughly in a bowl.
Add the cold butter and mix until the texture is crumbly, like an apple crumble topping.
Add the mashed potatoes and combine.
Add the buttermilk and water. Use a fork. This is a pancake batter, not bread dough, and the lumps are fine.
Melt 1 tablespoon butter in a hot skillet with a splash of oil so the butter doesn't burn.
Pour in the batter. When bubbles form across the top, flip. Each side takes about 1–2 minutes.
Oven option: spread the batter in a greased pan and bake at 450°F for 17–22 minutes.
