Whisk 1.5 cups of milk, 1 tablespoon sugar, and one egg together until all the sugar is dissolved. Tear about 2 slices of any kind of bread into a wide-brimmed mug or bowl. Pour egg mixture over, and push bread down to make sure it all gets soaked. Optional: stir in chocolate chips or dried fruit, and sprinkle cinnamon on top.
Microwave for 1min, then check to see if all the liquid has been absorbed. If not, stir, microwave for another 30s, and check again. Repeat until all liquid is absorbed.