- 1/2 cup milk
- 1/2 (1 ounce) square semisweet baking chocolate
- 2 teaspoons cornstarch
- 1 tablespoon sugar
- 1 dash salt
Place milk and chocolate in a 12-ounce microwave-safe mug or a 2-cup glass measuring cup.
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Microwave on High until hot but not boiling, 60 to 90 seconds. Stir to melt chocolate.
Stir cornstarch, sugar, and salt together in a small bowl; blend into the milk mixture.
Microwave on High for 30 seconds, stir, and continue to heat until mixture thickens and just begins to boil, about 15 seconds more.