If you like a little 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 butter, where they’ll crisp on the edges and make a wonderful side for breakfast eggs or grilled sausage. For a slightly different personality while still keeping the spirit of the recipe, you can swap in Yukon Gold potatoes for a creamier texture, or use a beef-flavored onion soup mix for a deeper, roast-like flavor, but keep it to the same three ingredients so it stays simple and true to the original idea.