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Make the pasta according to package instructions.
Preheat the oven to 400ºF (205°C).
Separate 2 tbsp. of milk from the cup and combine with the cornstarch in a small bowl until dissolved.
Heat the butter in a non-stick pan. Add the milk and cornstarch mixture, and stir until it starts to get thick.
Add the cheeses, mustard, salt, and pepper. Cook for 5 more minutes - stirring occasionally -or until the cheese has melted.
Add the cooked pasta and combine it with the cheese sauce.
Transfer to a baking dish, top with cheddar cheese, and bake for 10-15 minutes, or until golden brown on top.