Peel and slice the peaches; divide them among 4 microwave-safe dessert dishes.
Sprinkle each portion with a tablespoon of brown sugar.
Add a dash of cinnamon.
Arrange 3 pecan halves on each serving.
Cook 2 dishes at a time in the microwave for 4 to 5 minutes, or until the peaches are tender.
Let them cool to room temperature.