To serve 2 as a main course: Combine 1 cup milk and 2 tablespoons cornstarch in a 1-quart soufflé dish and cook for 3 minutes. Add ¾ cup cheese, 1½ teaspoons salt, 1 teaspoon butter, pepper, and 2½ cups cooked macaroni. Cook, uncovered, at 100% for 4 minutes.

To serve 4 as a main course: Combine 2 cups milk and 3 tablespoons cornstarch in a 10” × 8” dish and cook for 4 minutes. Add 1½ cups cheese, 2½ teaspoons salt, pepper, and 2 tablespoons butter. Fold in 5 cups cooked macaroni. Cook, uncovered, at 100% for 4 minutes 30 seconds.

This dish may be frozen. Line the cooking dish with 2 layers of microwave plastic wrap; cook as instructed. Fold plastic over cooked macaroni and cheese. Let cool, then freeze. To defrost, heat at 100% for 3 minutes. Unwrap, replace in cooking dish, and broil until bubbly.