Layer, pour, and let the slow cooker run: the full assembly method
Assembly follows a straightforward layering logic. The first half of the potato slices goes into the slow cooker, followed by half the chopped onion, a seasoning of salt, pepper, and garlic powder, and then 1 cup of shredded cheddar. The second half of the potatoes repeats the same sequence on top.

The sauce — condensed cream of chicken soup whisked together with the milk or half-and-half — is then poured evenly over the entire stack. The remaining cup of cheddar goes on last, sitting on top where it will melt into a golden, slightly set layer during cooking.
From that point, the recipe requires nothing further. No stirring, no checking, no basting. The slow cooker handles heat distribution, and the starch released by the potatoes gradually thickens the surrounding liquid into a sauce that coats every layer.
A 15-minute prep that works for potlucks, holidays, and cozy weeknights
With only 15 minutes of active preparation, the recipe fits naturally into the rhythm of a busy cooking day — particularly during the holidays, when oven space is at a premium. Delegating this dish to the slow cooker frees up the oven for roasts, casseroles, or desserts without any compromise on the final result.

The dish also travels well. Because it cooks and holds in the same vessel, it is well-suited to potlucks and communal meals where keeping food warm on arrival matters. The slow cooker can be switched to its warm setting once cooking is complete.
For anyone looking to adapt the recipe, the optional additions — a pinch of paprika for color or two tablespoons of butter stirred in at the end — add richness without changing the core method. The base recipe, however, is complete as written and requires no embellishment to deliver a satisfying, crowd-ready easy holiday side.
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