My husband made this the night I came home exhausted, and one bite melted the whole day away

potatoes, peeled and thinly sliced4 largeMedium onions, thinly sliced2Sharp cheddar cheese, shredded2 cupsUnsalted butter, divided4 tablespoonsAll-purpose flour1/4 cupWhole milk2 cupsSalt1 teaspoonBlack pepper1/2 teaspoonGarlic powder (optional)1/2 teaspoonFresh…

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