Combine first 3 ingredients in a large saucepan, and bring to a boil. Cover, reduce heat, and simmer rice mixture for 20 minutes.
Heat oil in a large skillet over medium-high heat. Add chicken and onions; sauté 8 minutes or until chicken is done. Preheat oven to 450º.
Arrange pear slices in a single layer on baking sheets coated with cooking spray. Bake pear slices at 450º for 10 minutes or until tender.
Combine rice mixture, chicken mixture, pears, cranberries, sugar, salt, and cinnamon in a large bowl. Toss gently.