2)Meanwhile, heat the milk in a small saucepan, but don’t boil it. Melt the butter in a medium pot and add the flour. Cook over low heat for 2 minutes, stirring with a whisk. While whisking, add the hot milk and cook for a minute or 2 more, until thickened and smooth. Off the heat, add cheese, 1 teaspoon salt, pepper. Add the cooked macaroni . Pour into 2 individual size gratin dishes.
3)Place the bread slices in a food processor fitted with a steel blade and pulse until you have coarse crumbs. Add the basil and pulse to combine. Sprinkle the bread crumb mixture over the top of the pasta. Bake for 35 to 40 minutes, or until the sauce is bubbly and the macaroni is browned on the top.