Start by melting butter in a medium saucepan over low to medium-low heat. Once it’s fully melted, sprinkle in flour while whisking constantly. It should turn into a thick paste almost immediately. Let it cook for a minute or two until it smells slightly nutty but not browned.

This step feels boring, but it sets everything up. If the base is off, the whole dip suffers later.

Slowly pour in the milk while whisking nonstop. Don’t dump it all in at once. I did that once when I was distracted, and I ended up chasing lumps around the pan for ten minutes.

Keep whisking until the mixture smooths out and starts to thicken slightly. It should look like a thin cream sauce.

Pour in the heavy cream and stir gently. The mixture will look richer and smoother almost immediately. Let it warm through for a couple of minutes, but do not let it boil.

You should see small steam rising, but no bubbling.

Lower the heat and slowly add shredded cheddar in small handfuls. Stir as it melts. This is the moment the dip transforms into something familiar.

The sauce should turn thick, glossy, and smooth. If it looks too thick, add a splash of milk.

Add salt, garlic powder, paprika, and mustard if using. Stir and taste. I usually pause here and adjust salt carefully because cheddar brands vary a lot.

Let it sit on low heat for another minute. The dip should coat a spoon but still drip slowly when lifted. If it feels too thick, loosen it slightly with milk.

At this point, it should smell buttery, cheesy, and slightly sharp in a way that reminds you of mall food courts and snack stands.