extra color and texture, leave the red potato skins on, as written, and let some pieces rest against the edges of the slow cooker so they deepen in color and pick up more of that dark onion coating. For a saltier, more robust flavor, you can use salted butter instead of unsalted, but taste before adding any extra salt since the onion soup mix is already seasoned.
To stretch the recipe for a bigger crowd, you can add up to another pound of potatoes and an extra half packet of onion soup mix, along with a tablespoon or two more melted butter, keeping the same method. If your slow cooker tends to run hot and you notice the edges browning too quickly, stir a bit more often and switch to LOW.
Leftovers reheat nicely in a skillet with just a touch of extra
