Preheat oven to 400.

Place liners in a muffin pan and spray with cookng spray.

Cook the macaroni according to the package directions.

Drain and return to the pan.

Add the cheese and stir until melted.

Whisk together the cornstarch, egg and milk, pour over the macaroni and mix.

Fill each cup with macaroni mixture.

Combine the butter and breadcrumbs and mix well.

Divide crumb mixture evenly over each muffin cup.

Bake for 20 minutes.