In the time it takes to make boxed macaroni and cheese, you can have a homemade version that’s creamy with lots of sharp Cheddar, studded with broccoli and doesn’t require making a roux. Instead, the sauce is thickened by the pasta’s starch: As the noodles cook in milk, the milk thickens to the consistency of cream and the pasta absorbs the seasonings. Here, that’s garlic powder, but you could also use mustard powder, ground cayenne or grated nutmeg like in traditional mac and cheese. The broccoli pieces end up soft and sweet, but if you want more bite, add them halfway through cooking.