Cook the pasta al dente: The pasta cooks again in the oven, so don't let it get too soft when you boil it or the finished mac and cheese can become mushy.
Shred the cheese yourself: Freshly shredded cheese melts more smoothly into the sauce than packaged shredded cheese.
Keep the sauce below a boil: Once the milk goes in, warm the sauce gently. Boiling it after adding the cheese can make the sauce grainy rather than smooth.
Spread the panko evenly: You want some of that buttery crunch with every serving, so scatter the breadcrumb mixture right to the edges of the baking dish.
Let it sit for a few minutes: I know it's tempting to dig straight in, but giving it a few minutes after baking lets the sauce settle a bit and makes it much easier to serve.
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