Cook the macaroni in plenty of salted water and a drizzle of oil until al dente. Drain and reserve

Meanwhile, make the sauce. In a saucepan, melt the butter and add the maizena, stirring until well combined.

Add the milk little by little and stirring constantly until it thickens a little.

Season with salt and pepper.

Add half of the grated cheese and wait until it is completely melted.

Mix the macaroni with this sauce and put in a baking dish.

Cover with the rest of the grated cheese.

Gratin until the cheese is golden and melted.