3. Step
Heat oil in the pot over medium heat. Stir in flour; cook, whisking constantly, until golden and toasty, 30 to 45 seconds. Gradually whisk in milk; cook, whisking constantly, until the sauce simmers and thickens, 1 to 2 minutes. Remove from heat and stir in cheese, salt, Worcestershire and garlic powder. Stir in the pasta. Top with the toasted breadcrumbs just before serving.