Microwave Macaroni and Cheese

1/2 cup milk
2 1/4 tsp cornstarch
1/2 cup cheddar cheese
3/4 tsp salt
2 tsp butter
1 1/4 cup cooked macaroni

Combine milk and cornstarch in a microwave-safe dish and cook for 4 minutes.
Add cheese, salt, pepper and butter. Fold in cooked macaroni. Cook, uncovered, for 4 minutes 30 seconds.