I need you to stop what you’re doing and go grab a piece of paper and a pen. I’ll wait.
Ok, got it? Write down these things:
4 potatoes
heavy cream
cheddar cheese
Parmesan cheese
onion
Those five ingredients, plus a few standard pantry items, is all you need to have the most OMG to-die-for potatoes. Ever. Seriously. This is the throw-away-all-your-gratin-recipes-because-this-is-all-you’ll-ever-need recipe. This is the one. The one that stops the searches. The one that makes the others run away in the fear. The one and only.
And now the backstory…
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