use a second onion if your slow cooker is large enough. The extra onion will cook down substantially and create more of the savory sauce that makes this dish so good over potatoes or noodles.
Cheese options: Swiss is the natural match here, but provolone or mozzarella can be substituted if that is what you have on hand. Provolone gives a slightly sharper finish, while mozzarella makes the topping milder and extra stretchy.
Make the sauce smoother: If the condensed soup sits in a thick layer, stir it briefly in
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